Changeset 2171 for code/trunk/src/util/Convert.h

Timestamp:

Nov 10, 2008, 12:05:03 AM (16 years ago)

Author:

landauf

Message:

merged revisions 2111-2170 from objecthierarchy branch back to trunk.

Location:

code/trunk

Files:

• . (modified) (1 prop)
• src/util (modified) (1 prop)
• src/util/Convert.h (modified) (6 diffs)

code/trunk/src/util/Convert.h

@@ -68 +68 @@
 #endif
 
-template <class FromType, class ToType>
-class ImplicitConversion
-{
-private:
-    ImplicitConversion(); ImplicitConversion(const ImplicitConversion&); ~ImplicitConversion();
-    // Gets chosen only if there is an implicit conversion from FromType to ToType.
-    static char test(ToType);
-    // Accepts any argument. Why do we not use a template? The reason is that with templates,
-    // the function above is only taken iff it is an exact type match. But since we want to
-    // check for implicit conversion, we have to use the ellipsis.
-    static long long test(...);
-    static FromType object; // helper object to handle private c'tor and d'tor
-public:
-    // test(object) only has 'long long' return type iff the compiler doesn't choose test(...)
-    enum { exists = (sizeof(test(object)) == sizeof(char)) };
-};
+namespace orxonox
+{
+    template <class FromType, class ToType>
+    class ImplicitConversion
+    {
+    private:
+        ImplicitConversion(); ImplicitConversion(const ImplicitConversion&); ~ImplicitConversion();
+        // Gets chosen only if there is an implicit conversion from FromType to ToType.
+        static char test(ToType);
+        // Accepts any argument. Why do we not use a template? The reason is that with templates,
+        // the function above is only taken iff it is an exact type match. But since we want to
+        // check for implicit conversion, we have to use the ellipsis.
+        static long long test(...);
+        static FromType object; // helper object to handle private c'tor and d'tor
+    public:
+        // test(object) only has 'long long' return type iff the compiler doesn't choose test(...)
+        enum { exists = (sizeof(test(object)) == sizeof(char)) };
+    };
+}
 
 #if ORXONOX_COMPILER == ORXONOX_COMPILER_MSVC
@@ -118 +121 @@
 */
 
-namespace
-{
-    //! Little template that maps integers to entire types (Alexandrescu 2001)
-    template <int I>
-    struct Int2Type { };
+namespace orxonox
+{
+    namespace
+    {
+        //! Little template that maps integers to entire types (Alexandrescu 2001)
+        template <int I>
+        struct Int2Type { };
+    }
+
+
+    ///////////////////
+    // No Conversion //
+    ///////////////////
+
+    // Default template. No conversion available at all.
+    template <class FromType, class ToType>
+    struct ConverterFallback
+    {
+        static bool convert(ToType* output, const FromType& input)
+        {
+            COUT(2) << "Could not convert value of type " << typeid(FromType).name()
+                    << " to type " << typeid(ToType).name() << std::endl;
+            return false;
+        }
+    };
+
+    // If all else fails, try a dynamic_cast for pointer types.
+    template <class FromType, class ToType>
+    struct ConverterFallback<FromType*, ToType*>
+    {
+        static bool convert(ToType** output, FromType* const input)
+        {
+            ToType* temp = dynamic_cast<ToType*>(input);
+            if (temp)
+            {
+                *output = temp;
+                return true;
+            }
+            else
+                return false;
+        }
+    };
 }
-
-
-///////////////////
-// No Conversion //
-///////////////////
-
-// Default template. No conversion available at all.
-template <class FromType, class ToType>
-struct ConverterFallback
-{
-    static bool convert(ToType* output, const FromType& input)
-    {
-        COUT(2) << "Could not convert value of type " << typeid(FromType).name()
-                << " to type " << typeid(ToType).name() << std::endl;
-        return false;
-    }
-};
-
-// If all else fails, try a dynamic_cast for pointer types.
-template <class FromType, class ToType>
-struct ConverterFallback<FromType*, ToType*>
-{
-    static bool convert(ToType** output, FromType* const input)
-    {
-        ToType* temp = dynamic_cast<ToType*>(input);
-        if (temp)
-        {
-            *output = temp;
-            return true;
-        }
-        else
-            return false;
-    }
-};
 
 
@@ -170 +176 @@
     static bool convert(ToType* output, const FromType& input)
     {
-        return ConverterFallback<FromType, ToType>::convert(output, input);
+        return orxonox::ConverterFallback<FromType, ToType>::convert(output, input);
     }
 };
@@ -185 +191 @@
     {
         std::string temp;
-        if (ConverterFallback<FromType, std::string>::convert(&temp, input))
+        if (orxonox::ConverterFallback<FromType, std::string>::convert(&temp, input))
         {
             std::operator <<(outstream, temp);
@@ -224 +230 @@
     inline bool operator >>(std::istream& instream, ToType& output)
     {
-        return ConverterFallback<std::string, ToType>
+        return orxonox::ConverterFallback<std::string, ToType>
             ::convert(&output, static_cast<std::istringstream&>(instream).str());
     }
@@ -247 +253 @@
 };
 
-
-///////////////////
-// Implicit Cast //
-///////////////////
-
-// implicit cast not possible, try stringstream conversion next
-template <class FromType, class ToType>
-inline bool convertImplicitely(ToType* output, const FromType& input, ::Int2Type<false>)
-{
-    return ConverterStringStream<FromType, ToType>::convert(output, input);
+namespace orxonox
+{
+
+    ///////////////////
+    // Implicit Cast //
+    ///////////////////
+
+    // implicit cast not possible, try stringstream conversion next
+    template <class FromType, class ToType>
+    inline bool convertImplicitely(ToType* output, const FromType& input, orxonox::Int2Type<false>)
+    {
+        return ConverterStringStream<FromType, ToType>::convert(output, input);
+    }
+
+    // We can cast implicitely
+    template <class FromType, class ToType>
+    inline bool convertImplicitely(ToType* output, const FromType& input, orxonox::Int2Type<true>)
+    {
+        (*output) = static_cast<ToType>(input);
+        return true;
+    }
+
+
+    ////////////////////////////////
+    // ConverterExplicit Fallback //
+    ////////////////////////////////
+
+    // Default template if no specialisation is available
+    template <class FromType, class ToType>
+    struct ConverterExplicit
+    {
+        static bool convert(ToType* output, const FromType& input)
+        {
+            // Try implict cast and probe first. If a simple cast is not possible, it will not compile
+            // We therefore have to out source it into another template function
+            const bool probe = ImplicitConversion<FromType, ToType>::exists;
+            return convertImplicitely(output, input, orxonox::Int2Type<probe>());
+        }
+    };
+
+
+    //////////////////////
+    // Public Functions //
+    //////////////////////
+
+    /**
+    @brief
+        Converts any value to any other as long as there exists a conversion.
+        Otherwise, the conversion will generate a runtime warning and return false.
+        For information about the different conversion methods (user defined too), see the section
+        'Actual conversion sequence' in this file above.
+    */
+    template <class FromType, class ToType>
+    inline bool convertValue(ToType* output, const FromType& input)
+    {
+        return ConverterExplicit<FromType, ToType>::convert(output, input);
+    }
+
+    // For compatibility reasons. The same, but with capital ConvertValue
+    template<class FromType, class ToType>
+    inline bool ConvertValue(ToType* output, const FromType& input)
+    {
+        return convertValue(output, input);
+    }
+
+    // Calls convertValue and returns true if the conversion was successful.
+    // Otherwise the fallback is used.
+    /**
+    @brief
+        Converts any value to any other as long as there exists a conversion.
+        Otherwise, the conversion will generate a runtime warning and return false.
+        For information about the different conversion methods (user defined too), see the section
+        'Actual conversion sequence' in this file above.
+        If the conversion doesn't succeed, 'fallback' is written to '*output'.
+    @param fallback
+        A default value that gets written to '*output' if there is no conversion.
+    */
+    template<class FromType, class ToType>
+    inline bool convertValue(ToType* output, const FromType& input, const ToType& fallback)
+    {
+        if (convertValue(output, input))
+            return true;
+        else
+        {
+            (*output) = fallback;
+            return false;
+        }
+    }
+
+    // for compatibility reason. (capital 'c' in ConvertValue)
+    template<class FromType, class ToType>
+    inline bool ConvertValue(ToType* output, const FromType& input, const ToType& fallback)
+    {
+        return convertValue(output, input, fallback);
+    }
+
+    // Directly returns the converted value, even if the conversion was not successful.
+    template<class FromType, class ToType>
+    inline ToType getConvertedValue(const FromType& input)
+    {
+        ToType output;
+        convertValue(&output, input);
+        return output;
+    }
+
+    // Directly returns the converted value, but uses the fallback on failure.
+    template<class FromType, class ToType>
+    inline ToType getConvertedValue(const FromType& input, const ToType& fallback)
+    {
+        ToType output;
+        convertValue(&output, input, fallback);
+        return output;
+    }
+
+    // Like getConvertedValue, but the template argument order is in reverse.
+    // That means you can call it exactly like static_cast<ToType>(fromTypeValue).
+    template<class ToType, class FromType>
+    inline ToType omni_cast(const FromType& input)
+    {
+        ToType output;
+        convertValue(&output, input);
+        return output;
+    }
+
+    // convert to string Shortcut
+    template <class FromType>
+    inline std::string convertToString(FromType value)
+    {
+      return getConvertedValue<FromType, std::string>(value);
+    }
+
+    // convert from string Shortcut
+    template <class ToType>
+    inline ToType convertFromString(std::string str)
+    {
+      return getConvertedValue<std::string, ToType>(str);
+    }
+
+    ////////////////////////////////
+    // Special string conversions //
+    ////////////////////////////////
+
+    // Delegate conversion from const char* to std::string
+    template <class ToType>
+    struct ConverterExplicit<const char*, ToType>
+    {
+        static bool convert(ToType* output, const char* input)
+        {
+            return convertValue<std::string, ToType>(output, input);
+        }
+    };
+
+    // These conversions would exhibit ambiguous << or >> operators when using stringstream
+    template <>
+    struct ConverterExplicit<char, std::string>
+    {
+        static bool convert(std::string* output, const char input)
+        {
+            *output = std::string(1, input);
+            return true;
+        }
+    };
+    template <>
+    struct ConverterExplicit<unsigned char, std::string>
+    {
+        static bool convert(std::string* output, const unsigned char input)
+        {
+            *output = std::string(1, input);
+            return true;
+        }
+    };
+    template <>
+    struct ConverterExplicit<std::string, char>
+    {
+        static bool convert(char* output, const std::string input)
+        {
+            if (input != "")
+                *output = input[0];
+            else
+                *output = '\0';
+            return true;
+        }
+    };
+    template <>
+    struct ConverterExplicit<std::string, unsigned char>
+    {
+        static bool convert(unsigned char* output, const std::string input)
+        {
+            if (input != "")
+                *output = input[0];
+            else
+                *output = '\0';
+            return true;
+        }
+    };
+
+
+    // bool to std::string
+    template <>
+    struct ConverterExplicit<bool, std::string>
+    {
+        static bool convert(std::string* output, const bool& input)
+        {
+            if (input)
+              *output = "true";
+            else
+              *output = "false";
+            return false;
+        }
+    };
+
+    // std::string to bool
+    template <>
+    struct ConverterExplicit<std::string, bool>
+    {
+        static bool convert(bool* output, const std::string& input)
+        {
+            std::string stripped = getLowercase(removeTrailingWhitespaces(input));
+            if (stripped == "true" || stripped == "on" || stripped == "yes")
+            {
+              *output = true;
+              return true;
+            }
+            else if (stripped == "false" || stripped == "off" || stripped == "no")
+            {
+              *output = false;
+              return true;
+            }
+
+            std::istringstream iss(input);
+            if (iss >> (*output))
+                return true;
+            else
+                return false;
+        }
+    };
 }
 
-// We can cast implicitely
-template <class FromType, class ToType>
-inline bool convertImplicitely(ToType* output, const FromType& input, ::Int2Type<true>)
-{
-    (*output) = static_cast<ToType>(input);
-    return true;
-}
-
-
-////////////////////////////////
-// ConverterExplicit Fallback //
-////////////////////////////////
-
-// Default template if no specialisation is available
-template <class FromType, class ToType>
-struct ConverterExplicit
-{
-    static bool convert(ToType* output, const FromType& input)
-    {
-        // Try implict cast and probe first. If a simple cast is not possible, it will not compile
-        // We therefore have to out source it into another template function
-        const bool probe = ImplicitConversion<FromType, ToType>::exists;
-        return convertImplicitely(output, input, ::Int2Type<probe>());
-    }
-};
-
-
-//////////////////////
-// Public Functions //
-//////////////////////
-
-/**
-@brief
-    Converts any value to any other as long as there exists a conversion.
-    Otherwise, the conversion will generate a runtime warning and return false.
-    For information about the different conversion methods (user defined too), see the section
-    'Actual conversion sequence' in this file above.
-*/
-template <class FromType, class ToType>
-inline bool convertValue(ToType* output, const FromType& input)
-{
-    return ConverterExplicit<FromType, ToType>::convert(output, input);
-}
-
-// For compatibility reasons. The same, but with capital ConvertValue
-template<class FromType, class ToType>
-inline bool ConvertValue(ToType* output, const FromType& input)
-{
-    return convertValue(output, input);
-}
-
-// Calls convertValue and returns true if the conversion was successful.
-// Otherwise the fallback is used.
-/**
-@brief
-    Converts any value to any other as long as there exists a conversion.
-    Otherwise, the conversion will generate a runtime warning and return false.
-    For information about the different conversion methods (user defined too), see the section
-    'Actual conversion sequence' in this file above.
-    If the conversion doesn't succeed, 'fallback' is written to '*output'.
-@param fallback
-    A default value that gets written to '*output' if there is no conversion.
-*/
-template<class FromType, class ToType>
-inline bool convertValue(ToType* output, const FromType& input, const ToType& fallback)
-{
-    if (convertValue(output, input))
-        return true;
-    else
-    {
-        (*output) = fallback;
-        return false;
-    }
-}
-
-// for compatibility reason. (capital 'c' in ConvertValue)
-template<class FromType, class ToType>
-inline bool ConvertValue(ToType* output, const FromType& input, const ToType& fallback)
-{
-    return convertValue(output, input, fallback);
-}
-
-// Directly returns the converted value, even if the conversion was not successful.
-template<class FromType, class ToType>
-inline ToType getConvertedValue(const FromType& input)
-{
-    ToType output;
-    convertValue(&output, input);
-    return output;
-}
-
-// Directly returns the converted value, but uses the fallback on failure.
-template<class FromType, class ToType>
-inline ToType getConvertedValue(const FromType& input, const ToType& fallback)
-{
-    ToType output;
-    convertValue(&output, input, fallback);
-    return output;
-}
-
-// Like getConvertedValue, but the template argument order is in reverse.
-// That means you can call it exactly like static_cast<ToType>(fromTypeValue).
-template<class ToType, class FromType>
-inline ToType omni_cast(const FromType& input)
-{
-    ToType output;
-    convertValue(&output, input);
-    return output;
-}
-
-// convert to string Shortcut
-template <class FromType>
-inline std::string convertToString(FromType value)
-{
-  return getConvertedValue<FromType, std::string>(value);
-}
-
-// convert from string Shortcut
-template <class ToType>
-inline ToType convertFromString(std::string str)
-{
-  return getConvertedValue<std::string, ToType>(str);
-}
-
-////////////////////////////////
-// Special string conversions //
-////////////////////////////////
-
-// Delegate conversion from const char* to std::string
-template <class ToType>
-struct ConverterExplicit<const char*, ToType>
-{
-    static bool convert(ToType* output, const char* input)
-    {
-        return convertValue<std::string, ToType>(output, input);
-    }
-};
-
-// These conversions would exhibit ambiguous << or >> operators when using stringstream
-template <>
-struct ConverterExplicit<char, std::string>
-{
-    static bool convert(std::string* output, const char input)
-    {
-        *output = std::string(1, input);
-        return true;
-    }
-};
-template <>
-struct ConverterExplicit<unsigned char, std::string>
-{
-    static bool convert(std::string* output, const unsigned char input)
-    {
-        *output = std::string(1, input);
-        return true;
-    }
-};
-template <>
-struct ConverterExplicit<std::string, char>
-{
-    static bool convert(char* output, const std::string input)
-    {
-        if (input != "")
-            *output = input[0];
-        else
-            *output = '\0';
-        return true;
-    }
-};
-template <>
-struct ConverterExplicit<std::string, unsigned char>
-{
-    static bool convert(unsigned char* output, const std::string input)
-    {
-        if (input != "")
-            *output = input[0];
-        else
-            *output = '\0';
-        return true;
-    }
-};
-
-
-// bool to std::string
-template <>
-struct ConverterExplicit<bool, std::string>
-{
-    static bool convert(std::string* output, const bool& input)
-    {
-        if (input)
-          *output = "true";
-        else
-          *output = "false";
-        return false;
-    }
-};
-
-// std::string to bool
-template <>
-struct ConverterExplicit<std::string, bool>
-{
-    static bool convert(bool* output, const std::string& input)
-    {
-        std::string stripped = getLowercase(removeTrailingWhitespaces(input));
-        if (stripped == "true" || stripped == "on" || stripped == "yes")
-        {
-          *output = true;
-          return true;
-        }
-        else if (stripped == "false" || stripped == "off" || stripped == "no")
-        {
-          *output = false;
-          return true;
-        }
-
-        std::istringstream iss(input);
-        if (iss >> (*output))
-            return true;
-        else
-            return false;
-    }
-};
-
 #endif /* _Convert_H__ */