[12175] | 1 | /* |
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| 2 | * ORXONOX - the hottest 3D action shooter ever to exist |
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| 3 | * > www.orxonox.net < |
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| 4 | * |
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| 5 | * |
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| 6 | * License notice: |
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| 7 | * |
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| 8 | * This program is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU General Public License |
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| 10 | * as published by the Free Software Foundation; either version 2 |
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| 11 | * of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | * GNU General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with this program; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 21 | * |
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| 22 | * Author: |
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| 23 | * Fabian 'x3n' Landau |
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| 24 | * Co-authors: |
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| 25 | * ... |
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| 26 | * |
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| 27 | */ |
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| 28 | |
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| 29 | /** |
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| 30 | @file |
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| 31 | @ingroup Command FunctorExecutor |
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| 32 | @brief Definition of orxonox::Functor and its specialized subclasses, as well as the createFunctor() functions. |
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| 33 | |
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| 34 | @anchor FunctorExample |
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| 35 | |
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| 36 | Functors can be used to wrap function-pointers. While function-pointers have a very |
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| 37 | complicated syntax in C++, Functors are always the same and you can call the wrapped |
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| 38 | function-pointer independently of its parameter with arguments of type MultiType. These |
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| 39 | arguments are then automatically converted to the right type. |
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| 40 | |
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| 41 | To create a Functor, the helper function createFunctor() is used. It returns an instance |
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| 42 | of orxonox::FunctorPtr which is simply a typedef of "std::shared_ptr<Functor>". This |
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| 43 | means you don't have to delete the Functor after using it, because it is managed |
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| 44 | by the std::shared_ptr. |
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| 45 | |
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| 46 | Example: |
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| 47 | @code |
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| 48 | int myStaticFunction(int value) // Definition of a static function |
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| 49 | { |
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| 50 | return (value * 2); // Return the double of the value |
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| 51 | } |
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| 52 | |
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| 53 | FunctorPtr functor = createFunctor(&myStaticFunction); // Create a Functor |
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| 54 | |
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| 55 | int result = (*functor)(5); // Calls the functor with value = 5, result == 10 |
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| 56 | |
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| 57 | int result = (*functor)("7"); // Calls the functor with a string which is converted to an integer, result == 14 |
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| 58 | @endcode |
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| 59 | |
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| 60 | Functors can also be used if you work with member-functions. In this case createFunctor() |
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| 61 | returns an instance of orxonox::FunctorMemberPtr - this allows you to define the object |
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| 62 | that will be used to call the function. |
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| 63 | |
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| 64 | Example: |
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| 65 | @code |
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| 66 | class MyClass // Define a class |
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| 67 | { |
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| 68 | public: |
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| 69 | MyClass(const std::string& text) // Constructor |
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| 70 | { |
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| 71 | this->text_ = text; |
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| 72 | } |
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| 73 | |
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| 74 | bool contains(const std::string& word) // Function that searches for "word" in "text" |
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| 75 | { |
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| 76 | return (this->text_.find(word) != std::string::npos); |
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| 77 | } |
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| 78 | |
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| 79 | private: |
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| 80 | std::string text_; // Member variable |
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| 81 | }; |
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| 82 | |
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| 83 | MyClass* object = new MyClass("Hello World"); // Create an object of type MyClass and set its text to "Hello World" |
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| 84 | |
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| 85 | FunctorPtr functor = createFunctor(&MyClass:contains, object); // Create a Functor (note the object!) |
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| 86 | |
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| 87 | bool result = (*functor)("World"); // result == true |
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| 88 | bool result = (*functor)("test"); // result == false |
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| 89 | @endcode |
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| 90 | |
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| 91 | Instead of assigning the object directly to the functor when creating it, you can also define |
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| 92 | it at any later point or when you call the functor. Note however that this works only with |
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| 93 | orxonox::FunctorMember. |
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| 94 | |
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| 95 | @code |
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| 96 | MyClass* object1 = new MyClass("Hello World"); // Create an object |
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| 97 | MyClass* object2 = new MyClass("this is a test"); // Create another object |
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| 98 | |
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| 99 | FunctorMemberPtr functor = createFunctor(&MyClass:contains); // Create a FunctorMember (note: no object this time) |
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| 100 | |
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| 101 | bool result = (*functor)("World"); // result == false and an error: "Error: Can't execute FunctorMember, no object set." |
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| 102 | |
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| 103 | bool result = (*functor)(object1, "World"); // result == true |
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| 104 | bool result = (*functor)(object1, "test"); // result == false |
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| 105 | bool result = (*functor)(object2, "test"); // result == true |
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| 106 | |
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| 107 | functor->setObject(object1); // Assign an object to the FunctorMember |
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| 108 | |
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| 109 | bool result = (*functor)("World"); // result == true (no error this time, because the object was set using setObject()) |
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| 110 | @endcode |
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| 111 | */ |
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| 112 | |
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| 113 | #ifndef _Functor_H__ |
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| 114 | #define _Functor_H__ |
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| 115 | |
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| 116 | #include "core/CorePrereqs.h" |
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| 117 | |
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| 118 | #include <typeinfo> |
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| 119 | |
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| 120 | #include "util/Output.h" |
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| 121 | #include "util/MultiType.h" |
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| 122 | #include "core/object/Destroyable.h" |
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| 123 | #include "FunctorPtr.h" |
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| 124 | |
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| 125 | namespace orxonox |
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| 126 | { |
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| 127 | const unsigned int MAX_FUNCTOR_ARGUMENTS = 5; ///< The maximum number of parameters of a function that is supported by Functor |
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| 128 | |
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| 129 | namespace detail |
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| 130 | { |
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| 131 | template <class T> |
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| 132 | inline std::string _typeToString() { return "unknown"; } |
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| 133 | |
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| 134 | template <> inline std::string _typeToString<void>() { return "void"; } |
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| 135 | template <> inline std::string _typeToString<int>() { return "int"; } |
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| 136 | template <> inline std::string _typeToString<unsigned int>() { return "uint"; } |
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| 137 | template <> inline std::string _typeToString<char>() { return "char"; } |
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| 138 | template <> inline std::string _typeToString<unsigned char>() { return "uchar"; } |
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| 139 | template <> inline std::string _typeToString<short>() { return "short"; } |
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| 140 | template <> inline std::string _typeToString<unsigned short>() { return "ushort"; } |
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| 141 | template <> inline std::string _typeToString<long>() { return "long"; } |
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| 142 | template <> inline std::string _typeToString<unsigned long>() { return "ulong"; } |
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| 143 | template <> inline std::string _typeToString<long long>() { return "longlong"; } |
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| 144 | template <> inline std::string _typeToString<unsigned long long>() { return "ulonglong"; } |
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| 145 | template <> inline std::string _typeToString<float>() { return "float"; } |
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| 146 | template <> inline std::string _typeToString<double>() { return "double"; } |
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| 147 | template <> inline std::string _typeToString<long double>() { return "longdouble"; } |
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| 148 | template <> inline std::string _typeToString<bool>() { return "bool"; } |
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| 149 | template <> inline std::string _typeToString<std::string>() { return "string"; } |
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| 150 | template <> inline std::string _typeToString<Vector2>() { return "Vector2"; } |
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| 151 | template <> inline std::string _typeToString<Vector3>() { return "Vector3"; } |
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| 152 | template <> inline std::string _typeToString<Quaternion>() { return "Quaternion"; } |
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| 153 | template <> inline std::string _typeToString<ColourValue>() { return "ColourValue"; } |
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| 154 | template <> inline std::string _typeToString<Radian>() { return "Radian"; } |
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| 155 | template <> inline std::string _typeToString<Degree>() { return "Degree"; } |
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| 156 | } |
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| 157 | |
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| 158 | /// Returns the name of type @a T as string. |
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| 159 | template <class T> |
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| 160 | inline std::string typeToString() { return detail::_typeToString<typename Loki::TypeTraits<T>::UnqualifiedReferredType>(); } |
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| 161 | |
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| 162 | /** |
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| 163 | @brief The Functor classes are used to wrap function pointers. |
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| 164 | |
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| 165 | Function-pointers in C++ have a pretty complicated syntax and you can't store |
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| 166 | and call them unless you know the exact type. A Functor can be used to wrap |
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| 167 | a function-pointer and to store it independent of its type. You can also call |
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| 168 | it independently of its parameters by passing the arguments as MultiType. They |
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| 169 | are converted automatically to the right type. |
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| 170 | |
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| 171 | Functor is a pure virtual base class. |
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| 172 | |
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| 173 | @see See @ref FunctorExample "Functor.h" for some examples. |
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| 174 | */ |
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| 175 | class _CoreExport Functor |
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| 176 | { |
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| 177 | public: |
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| 178 | /// Defines the type of a function (static or member) |
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| 179 | enum class Type |
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| 180 | { |
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| 181 | Static, |
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| 182 | Member |
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| 183 | }; |
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| 184 | |
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| 185 | public: |
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| 186 | virtual ~Functor() = default; |
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| 187 | |
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| 188 | /// Calls the function-pointer with up to five arguments. In case of a member-function, the assigned object-pointer is used to call the function. @return Returns the return-value of the function (if any; MultiType::Null otherwise) |
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| 189 | virtual MultiType operator()(const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) = 0; |
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| 190 | |
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| 191 | /// Creates a new instance of Functor with the same values like this (used instead of a copy-constructor) |
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| 192 | virtual FunctorPtr clone() = 0; |
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| 193 | |
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| 194 | /// Returns the type of the function: static or member. |
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| 195 | virtual Type getType() const = 0; |
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| 196 | /// Returns the number of parameters of the function. |
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| 197 | virtual unsigned int getParamCount() const = 0; |
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| 198 | /// Returns true if the function has a return-value. |
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| 199 | virtual bool hasReturnvalue() const = 0; |
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| 200 | |
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| 201 | /// Returns the type-name of the parameter with given index (the first parameter has index 0). |
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| 202 | virtual std::string getTypenameParam(unsigned int index) const = 0; |
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| 203 | /// Returns the type-name of the return-value. |
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| 204 | virtual std::string getTypenameReturnvalue() const = 0; |
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| 205 | |
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| 206 | /// Converts a given argument to the type of the parameter with given index (the first parameter has index 0). |
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| 207 | virtual void evaluateArgument(unsigned int index, MultiType& argument) const = 0; |
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| 208 | |
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| 209 | /// Assigns an object-pointer to the functor which is used to execute a member-function. |
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| 210 | virtual void setRawObjectPointer(void* object) = 0; |
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| 211 | /// Returns the object-pointer. |
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| 212 | virtual void* getRawObjectPointer() const = 0; |
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| 213 | |
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| 214 | /// Enables or disables the safe mode which causes the functor to change the object pointer to nullptr if the object is deleted (only member functors). |
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| 215 | virtual void setSafeMode(bool bSafeMode) = 0; |
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| 216 | |
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| 217 | /// Returns the full identifier of the function-pointer which is defined as typeid(@a F), where @a F is the type of the stored function-pointer. Used to compare functors. |
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| 218 | virtual const std::type_info& getFullIdentifier() const = 0; |
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| 219 | /// Returns an identifier of the header of the function (doesn't include the function's class). Used to compare functors. |
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| 220 | virtual const std::type_info& getHeaderIdentifier() const = 0; |
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| 221 | /// Returns an identifier of the header of the function (doesn't include the function's class), but regards only the first @a params parameters. Used to compare functions if an Executor provides default-values for the other parameters. |
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| 222 | virtual const std::type_info& getHeaderIdentifier(unsigned int params) const = 0; |
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| 223 | }; |
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| 224 | |
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| 225 | /** |
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| 226 | @brief FunctorMember is a child class of Functor and expands it with an object-pointer, that |
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| 227 | is used for member-functions, as well as an overloaded execution operator. |
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| 228 | |
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| 229 | @param O The type of the function's class (or void if it's a static function) |
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| 230 | |
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| 231 | Note that FunctorMember is also used for static functions, but with T = void. FunctorStatic |
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| 232 | is a typedef of FunctorMember<void>. The void* object-pointer is ignored in this case. |
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| 233 | |
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| 234 | @see See @ref FunctorExample "Functor.h" for some examples. |
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| 235 | */ |
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| 236 | template <class O> |
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| 237 | class FunctorMember : public Functor, public DestructionListener |
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| 238 | { |
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| 239 | public: |
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| 240 | /// Constructor: Stores the object-pointer. |
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| 241 | FunctorMember(O* object = nullptr) : object_(object), bSafeMode_(false) {} |
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| 242 | virtual ~FunctorMember() { if (this->bSafeMode_) { this->unregisterObject(this->object_); } } |
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| 243 | |
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| 244 | /// Calls the function-pointer with up to five arguments and an object. In case of a static-function, the object can be nullptr. @return Returns the return-value of the function (if any; MultiType::Null otherwise) |
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| 245 | virtual MultiType operator()(O* object, const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) = 0; |
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| 246 | |
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| 247 | // see Functor::operator()() |
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| 248 | virtual MultiType operator()(const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) override |
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| 249 | { |
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| 250 | // call the function if an object was assigned |
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| 251 | if (this->object_) |
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| 252 | return (*this)(this->object_, param1, param2, param3, param4, param5); |
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| 253 | else |
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| 254 | { |
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| 255 | orxout(internal_error) << "Can't execute FunctorMember, no object set." << endl; |
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| 256 | return MultiType::Null; |
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| 257 | } |
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| 258 | } |
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| 259 | |
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| 260 | // see Functor::getType() |
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| 261 | virtual inline Functor::Type getType() const override |
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| 262 | { return Functor::Type::Member; } |
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| 263 | |
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| 264 | /// Assigns an object-pointer to the functor which is used to execute a member-function. |
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| 265 | inline void setObject(O* object) |
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| 266 | { |
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| 267 | if (this->bSafeMode_ && object != this->object_) |
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| 268 | { |
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| 269 | this->unregisterObject(this->object_); |
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| 270 | this->registerObject(object); |
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| 271 | } |
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| 272 | this->object_ = object; |
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| 273 | } |
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| 274 | /// Returns the object-pointer. |
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| 275 | inline O* getObject() const |
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| 276 | { return this->object_; } |
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| 277 | |
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| 278 | // see Functor::setRawObjectPointer() |
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| 279 | virtual inline void setRawObjectPointer(void* object) override |
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| 280 | { this->setObject((O*)object); } |
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| 281 | // see Functor::getRawObjectPointer() |
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| 282 | virtual inline void* getRawObjectPointer() const override |
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| 283 | { return this->object_; } |
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| 284 | |
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| 285 | // see Functor::setSafeMode() |
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| 286 | virtual inline void setSafeMode(bool bSafeMode) override |
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| 287 | { |
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| 288 | if (bSafeMode == this->bSafeMode_) |
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| 289 | return; |
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| 290 | |
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| 291 | this->bSafeMode_ = bSafeMode; |
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| 292 | |
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| 293 | if (bSafeMode) |
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| 294 | this->registerObject(this->object_); |
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| 295 | else |
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| 296 | this->unregisterObject(this->object_); |
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| 297 | } |
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| 298 | |
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| 299 | protected: |
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| 300 | /// Casts the object and registers as destruction listener if the object is a Destroyable. |
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| 301 | inline void registerObject(Destroyable* object) |
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| 302 | { this->registerAsDestructionListener(object); } |
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| 303 | |
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| 304 | inline void registerObject(void* object) {} |
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| 305 | |
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| 306 | /// Casts the object and unregisters as destruction listener if the object is a Destroyable. |
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| 307 | inline void unregisterObject(Destroyable* object) |
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| 308 | { this->unregisterAsDestructionListener(object); } |
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| 309 | |
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| 310 | inline void unregisterObject(void* object) {} |
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| 311 | |
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| 312 | /// Will be called by Destroyable::~Destroyable() if the stored object is a Destroyable and deleted and the Functor is in safe mode. |
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| 313 | virtual inline void objectDeleted() override |
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| 314 | { this->object_ = nullptr; } |
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| 315 | |
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| 316 | O* object_; ///< The stored object-pointer, used to execute a member-function (or nullptr for static functions) |
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| 317 | bool bSafeMode_; ///< If true, the functor is in safe mode and registers itself as listener at the object and changes the pointer to nullptr if the object is deleted |
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| 318 | }; |
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| 319 | |
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| 320 | /// Specialization of FunctorMember with @a T = void. |
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| 321 | template <> |
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| 322 | class FunctorMember<void> : public Functor |
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| 323 | { |
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| 324 | public: |
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| 325 | /// Constructor: Stores the object-pointer. |
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| 326 | FunctorMember(void* object = nullptr) {} |
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| 327 | |
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| 328 | /// Calls the function-pointer with up to five arguments and an object. In case of a static-function, the object can be nullptr. @return Returns the return-value of the function (if any; MultiType::Null otherwise) |
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| 329 | virtual MultiType operator()(void* object, const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) = 0; |
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| 330 | |
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| 331 | // see Functor::operator()() |
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| 332 | virtual MultiType operator()(const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) override |
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| 333 | { |
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| 334 | return (*this)((void*)nullptr, param1, param2, param3, param4, param5); |
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| 335 | } |
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| 336 | |
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| 337 | // see Functor::getType() |
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| 338 | virtual inline Functor::Type getType() const override |
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| 339 | { return Functor::Type::Static; } |
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| 340 | |
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| 341 | // see Functor::setRawObjectPointer() |
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| 342 | virtual inline void setRawObjectPointer(void*) override |
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| 343 | { orxout(internal_warning) << "Can't assign an object pointer to a static functor" << endl; } |
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| 344 | // see Functor::getRawObjectPointer() |
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| 345 | virtual inline void* getRawObjectPointer() const override |
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| 346 | { return nullptr; } |
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| 347 | |
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| 348 | // see Functor::setSafeMode() |
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| 349 | virtual inline void setSafeMode(bool) override {} |
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| 350 | }; |
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| 351 | |
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| 352 | /// FunctorStatic is just a typedef of FunctorMember with @a T = void. |
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| 353 | typedef FunctorMember<void> FunctorStatic; |
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| 354 | |
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| 355 | /** |
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| 356 | @brief FunctorPointer is a child class of FunctorMember and extends it with a function-pointer (or a function-object). |
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| 357 | @param F The type of the function-pointer (or the function-object) |
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| 358 | @param O The type of the function's class (or void if it's a static function or a function-object) |
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| 359 | |
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| 360 | The template FunctorPointer has an additional template parameter that defines the type |
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| 361 | of the function-pointer (or the function-object). This can be handy if you want to get |
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| 362 | or set the function-pointer (or the function-object). You can then use a static_cast |
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| 363 | to cast a Functor to FunctorPointer if you know the type of the function. |
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| 364 | |
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| 365 | However FunctorPointer is not aware of the types of the different parameters or the |
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| 366 | return value. |
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| 367 | */ |
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| 368 | template <class F, class O = void> |
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| 369 | class FunctorPointer : public FunctorMember<O> |
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| 370 | { |
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| 371 | public: |
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| 372 | /// Constructor: Initializes the base class and stores the function-pointer. |
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| 373 | FunctorPointer(F functionPointer, O* object = nullptr) : FunctorMember<O>(object), functionPointer_(functionPointer) {} |
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| 374 | |
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| 375 | /// Changes the function-pointer. |
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| 376 | inline void setFunction(F functionPointer) |
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| 377 | { this->functionPointer_ = functionPointer; } |
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| 378 | /// Returns the function-pointer. |
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| 379 | inline F getFunction() const |
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| 380 | { return this->functionPointer_; } |
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| 381 | |
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| 382 | protected: |
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| 383 | F functionPointer_; ///< The stored function-pointer |
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| 384 | }; |
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| 385 | |
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| 386 | namespace detail |
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| 387 | { |
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| 388 | // Helper class to get the type of the function-pointer (or the function-object) with the given class, parameters, return-value, and constness |
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| 389 | template <class F, class R, class O, bool isconst, class... Params> struct FunctionType /* generic type is undefined */; |
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| 390 | template < class R, class O, class... Params> struct FunctionType<void, R, O, false, Params...> { typedef R (O::*Type)(Params...); }; // spezialization: non-const member function |
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| 391 | template < class R, class O, class... Params> struct FunctionType<void, R, O, true, Params...> { typedef R (O::*Type)(Params...) const; }; // spezialization: const member function |
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| 392 | template < class R, class... Params> struct FunctionType<void, R, void, false, Params...> { typedef R (*Type)(Params...); }; // spezialization: static function |
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| 393 | template <class F, class R, class... Params> struct FunctionType<F, R, void, false, Params...> { typedef F Type; }; // spezialization: function object |
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| 394 | |
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| 395 | // Helper class, used to call a function with a given object and parameters and to return its return-value (if available) |
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| 396 | template <class F, class R, class O, bool isconst, class... Params> struct FunctorCaller /* generic type is undefined */; |
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| 397 | template < class R, class O, bool isconst, class... Params> struct FunctorCaller<void, R, O, isconst, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<void, R, O, isconst, Params...>::Type functionPointer, O* object, const Params&... parameters, const UnusedParams&...) { return (object->*functionPointer)(parameters...); } }; // spezialization: member function with return value |
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| 398 | template < class O, bool isconst, class... Params> struct FunctorCaller<void, void, O, isconst, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<void, void, O, isconst, Params...>::Type functionPointer, O* object, const Params&... parameters, const UnusedParams&...) { (object->*functionPointer)(parameters...); return MultiType::Null; } }; // spezialization: member function without return value |
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| 399 | template < class R, class... Params> struct FunctorCaller<void, R, void, false, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<void, R, void, false, Params...>::Type functionPointer, void*, const Params&... parameters, const UnusedParams&...) { return (*functionPointer)(parameters...); } }; // spezialization: static function with return value |
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| 400 | template < class... Params> struct FunctorCaller<void, void, void, false, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<void, void, void, false, Params...>::Type functionPointer, void*, const Params&... parameters, const UnusedParams&...) { (*functionPointer)(parameters...); return MultiType::Null; } }; // spezialization: static function without return value |
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| 401 | template <class F, class R, class... Params> struct FunctorCaller<F, R, void, false, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<F, R, void, false, Params...>::Type functor, void*, const Params&... parameters, const UnusedParams&...) { return functor(parameters...); } }; // spezialization: function object with return value |
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| 402 | template <class F, class... Params> struct FunctorCaller<F, void, void, false, Params...> { template <class... UnusedParams> static inline MultiType call(typename detail::FunctionType<F, void, void, false, Params...>::Type functor, void*, const Params&... parameters, const UnusedParams&...) { functor(parameters...); return MultiType::Null; } }; // spezialization: function object without return value |
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| 403 | |
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| 404 | // Helper class to determine if a function has a returnvalue |
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| 405 | template <class T> |
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| 406 | struct FunctorHasReturnvalue |
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| 407 | { enum { result = true }; }; |
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| 408 | template <> |
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| 409 | struct FunctorHasReturnvalue<void> |
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| 410 | { enum { result = false }; }; |
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| 411 | |
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| 412 | // Helper class to determine the N-th parameter of a variadic template (with 0 being the index of the first parameter) |
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| 413 | template <int n, typename T = void, typename... Other> |
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| 414 | struct GetNthParamType |
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| 415 | { typedef typename GetNthParamType<n - 1, Other...>::Type Type; }; |
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| 416 | template <typename T, typename... Other> |
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| 417 | struct GetNthParamType<0, T, Other...> |
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| 418 | { typedef T Type; }; |
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| 419 | |
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| 420 | // Helper structs to deduce the first N types of a parameter pack |
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| 421 | template<class... Types> struct type_list {}; |
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| 422 | |
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| 423 | template <class T1, class... AllTypes> |
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| 424 | struct make_type_list_helper |
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| 425 | { |
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| 426 | template <std::size_t N, class... Types> |
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| 427 | struct make_type_list_impl : make_type_list_helper<AllTypes...>::template make_type_list_impl<N - 1, Types..., T1> {}; |
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| 428 | |
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| 429 | template <class... Types> |
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| 430 | struct make_type_list_impl<1u, Types...> : type_list<Types..., T1> {}; |
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| 431 | }; |
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| 432 | |
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| 433 | template <class T1> |
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| 434 | struct make_type_list_helper<T1> |
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| 435 | { |
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| 436 | template <std::size_t N, class... Types> |
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| 437 | struct make_type_list_impl : type_list<Types..., T1> {}; |
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| 438 | }; |
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| 439 | |
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| 440 | template <std::size_t N, class... Types> |
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| 441 | struct make_type_list : make_type_list_helper<Types...>::template make_type_list_impl<N> {}; |
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| 442 | |
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| 443 | template <class... Types> |
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| 444 | struct make_type_list<0u, Types...> : type_list<> {}; |
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| 445 | |
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| 446 | template <std::size_t N> |
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| 447 | struct make_type_list<N> : type_list<> {}; |
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| 448 | |
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| 449 | template <> |
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| 450 | struct make_type_list<0u> : type_list<> {}; |
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| 451 | } |
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| 452 | |
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| 453 | /** |
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| 454 | @brief FunctorTemplate is a child class of FunctorPointer and implements all functions |
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| 455 | that need to know the exact types of the parameters, return-value, and class. |
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| 456 | |
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| 457 | @param F the type of the function-object (or void if a function-pointer is used). |
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| 458 | @param R The type of the return-value of the function |
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| 459 | @param O The class of the function |
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| 460 | @param isconst True if the function is a const member-function |
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| 461 | @param Params The types of the parameters |
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| 462 | |
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| 463 | This template has many parameters and is usually not used directly. It is created by |
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| 464 | createFunctor(), but only the base-classes Functor, FunctorMember, and FunctorPointer |
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| 465 | are used directly. It implements all the virtual functions that are declared by its |
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| 466 | base classes. |
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| 467 | |
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| 468 | All template arguments can be void. |
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| 469 | */ |
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| 470 | template <class F, class R, class O, bool isconst, class... Params> |
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| 471 | class FunctorTemplate : public FunctorPointer<typename detail::FunctionType<F, R, O, isconst, Params...>::Type, O> |
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| 472 | { |
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| 473 | static_assert(sizeof...(Params) <= 5, "Only up to 5 parameters are supported"); |
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| 474 | |
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| 475 | public: |
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| 476 | /// Constructor: Initializes the base class. |
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| 477 | FunctorTemplate(typename detail::FunctionType<F, R, O, isconst, Params...>::Type functionPointer, O* object = nullptr) : FunctorPointer<typename detail::FunctionType<F, R, O, isconst, Params...>::Type, O>(functionPointer, object) {} |
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| 478 | |
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| 479 | // see FunctorMember::operator()() |
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| 480 | virtual MultiType operator()(O* object, const MultiType& param1 = MultiType::Null, const MultiType& param2 = MultiType::Null, const MultiType& param3 = MultiType::Null, const MultiType& param4 = MultiType::Null, const MultiType& param5 = MultiType::Null) override |
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| 481 | { |
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| 482 | return detail::FunctorCaller<F, R, O, isconst, Params...>::call(this->functionPointer_, object, param1, param2, param3, param4, param5); |
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| 483 | } |
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| 484 | |
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| 485 | // see Functor::clone() |
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| 486 | virtual FunctorPtr clone() override |
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| 487 | { |
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| 488 | return std::make_shared<FunctorTemplate>(*this); |
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| 489 | } |
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| 490 | |
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| 491 | // see Functor::evaluateArgument() |
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| 492 | virtual void evaluateArgument(unsigned int index, MultiType& argument) const override |
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| 493 | { |
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| 494 | switch (index) |
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| 495 | { |
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| 496 | case 0: argument.convert<typename detail::GetNthParamType<0, Params...>::Type>(); break; |
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| 497 | case 1: argument.convert<typename detail::GetNthParamType<1, Params...>::Type>(); break; |
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| 498 | case 2: argument.convert<typename detail::GetNthParamType<2, Params...>::Type>(); break; |
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| 499 | case 3: argument.convert<typename detail::GetNthParamType<3, Params...>::Type>(); break; |
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| 500 | case 4: argument.convert<typename detail::GetNthParamType<4, Params...>::Type>(); break; |
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| 501 | } |
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| 502 | } |
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| 503 | |
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| 504 | // see Functor::getParamCount() |
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| 505 | virtual unsigned int getParamCount() const override |
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| 506 | { |
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| 507 | return sizeof...(Params); |
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| 508 | } |
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| 509 | |
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| 510 | // see Functor::hasReturnvalue() |
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| 511 | virtual bool hasReturnvalue() const override |
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| 512 | { |
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| 513 | return detail::FunctorHasReturnvalue<R>::result; |
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| 514 | } |
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| 515 | |
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| 516 | // see Functor::getTypenameParam() |
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| 517 | virtual std::string getTypenameParam(unsigned int index) const override |
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| 518 | { |
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| 519 | switch (index) |
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| 520 | { |
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| 521 | case 0: return typeToString<typename detail::GetNthParamType<0, Params...>::Type>(); |
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| 522 | case 1: return typeToString<typename detail::GetNthParamType<1, Params...>::Type>(); |
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| 523 | case 2: return typeToString<typename detail::GetNthParamType<2, Params...>::Type>(); |
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| 524 | case 3: return typeToString<typename detail::GetNthParamType<3, Params...>::Type>(); |
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| 525 | case 4: return typeToString<typename detail::GetNthParamType<4, Params...>::Type>(); |
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| 526 | default: return ""; |
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| 527 | } |
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| 528 | } |
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| 529 | |
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| 530 | // see Functor::getTypenameReturnvalue() |
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| 531 | virtual std::string getTypenameReturnvalue() const override |
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| 532 | { |
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| 533 | return typeToString<R>(); |
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| 534 | } |
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| 535 | |
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| 536 | // see Functor::getFullIdentifier() |
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| 537 | virtual const std::type_info& getFullIdentifier() const override |
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| 538 | { |
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| 539 | return typeid(typename detail::FunctionType<void, R, O, isconst, Params...>::Type); |
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| 540 | } |
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| 541 | |
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| 542 | // see Functor::getHeaderIdentifier() |
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| 543 | virtual const std::type_info& getHeaderIdentifier() const override |
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| 544 | { |
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| 545 | return typeid(typename detail::FunctionType<void, R, void, false, Params...>::Type); |
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| 546 | } |
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| 547 | |
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| 548 | // see Functor::getHeaderIdentifier(unsigned int) |
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| 549 | virtual const std::type_info& getHeaderIdentifier(unsigned int params) const override |
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| 550 | { |
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| 551 | switch (params) |
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| 552 | { |
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| 553 | case 0: return this->getTypelistIdentifier(detail::make_type_list<0, Params...>{}); |
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| 554 | case 1: return this->getTypelistIdentifier(detail::make_type_list<1, Params...>{}); |
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| 555 | case 2: return this->getTypelistIdentifier(detail::make_type_list<2, Params...>{}); |
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| 556 | case 3: return this->getTypelistIdentifier(detail::make_type_list<3, Params...>{}); |
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| 557 | case 4: return this->getTypelistIdentifier(detail::make_type_list<4, Params...>{}); |
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| 558 | default: return this->getTypelistIdentifier(detail::make_type_list<5, Params...>{}); |
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| 559 | } |
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| 560 | } |
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| 561 | |
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| 562 | private: |
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| 563 | /// Helper function that deduces a parameter pack of types and returns the corresponding identifier |
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| 564 | template<class... Types> |
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| 565 | const std::type_info& getTypelistIdentifier(detail::type_list<Types...>) const |
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| 566 | { |
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| 567 | return typeid(typename detail::FunctionType<void, R, void, false, Types...>::Type); |
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| 568 | } |
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| 569 | }; |
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| 570 | |
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| 571 | |
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| 572 | namespace detail |
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| 573 | { |
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| 574 | // Helper functions to deduce types and constness of operator() and return the correct FunctorTemplate |
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| 575 | template <class F> |
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| 576 | struct CallableHelper |
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| 577 | { |
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| 578 | template <class R, class... Params> static inline FunctorStaticPtr create(const F& functionObject, R(F::*)(Params...)) { return std::make_shared<FunctorTemplate<F, R, void, false, Params...>>(functionObject); } |
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| 579 | template <class R, class... Params> static inline FunctorStaticPtr create(const F& functionObject, R(F::*)(Params...) const) { return std::make_shared<FunctorTemplate<F, R, void, false, Params...>>(functionObject); } // note: both const and non-const function-objects are treated as static functors with isconst=false. |
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| 580 | }; |
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| 581 | } |
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| 582 | |
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| 583 | template <class R, class O, class OO, class... Params> inline FunctorMemberPtr<O> createFunctor(R (O::*functionPointer)(Params...), OO* object) { return std::make_shared<FunctorTemplate<void, R, O, false, Params...>>(functionPointer, object); } ///< Creates a new FunctorMember with the given function-pointer and an assigned object |
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| 584 | template <class R, class O, class OO, class... Params> inline FunctorMemberPtr<O> createFunctor(R (O::*functionPointer)(Params...) const, OO* object) { return std::make_shared<FunctorTemplate<void, R, O, true, Params...>>(functionPointer, object); } ///< Creates a new FunctorMember with the given function-pointer and an assigned object |
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| 585 | |
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| 586 | template <class R, class O, class... Params> inline FunctorMemberPtr<O> createFunctor(R (O::*functionPointer)(Params...)) { return std::make_shared<FunctorTemplate<void, R, O, false, Params...>>(functionPointer); } ///< Creates a new FunctorMember with the given function-pointer |
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| 587 | template <class R, class O, class... Params> inline FunctorMemberPtr<O> createFunctor(R (O::*functionPointer)(Params...) const) { return std::make_shared<FunctorTemplate<void, R, O, true, Params...>>(functionPointer); } ///< Creates a new FunctorMember with the given function-pointer |
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| 588 | |
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| 589 | template <class R, class... Params> inline FunctorStaticPtr createFunctor(R (*functionPointer)(Params...)) { return std::make_shared<FunctorTemplate<void, R, void, false, Params...>>(functionPointer); } ///< Creates a new FunctorStatic with the given function-pointer |
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| 590 | |
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| 591 | /** Take care that this functor does not outlive objects that have been captured by reference in a lambda. */ |
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| 592 | template <class F> inline FunctorStaticPtr createFunctor(const F& functionObject) { return detail::CallableHelper<F>::create(functionObject, &F::operator()); } ///< Creates a new Functor with a callable object |
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| 593 | } |
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| 594 | |
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| 595 | #endif /* _Functor_H__ */ |
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