Last change
on this file since 12175 was
12175,
checked in by siramesh, 5 years ago
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Super Orxo Bros (Sidharth Ramesh, Nisa Balta, Jeff Ren)
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File size:
1.0 KB
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Rev | Line | |
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[12175] | 1 | #ifndef IS_CALLABLE_H |
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| 2 | #define IS_CALLABLE_H |
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| 3 | |
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| 4 | #include <type_traits> |
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| 5 | |
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| 6 | /** |
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| 7 | * @brief Implementation of IsCallable |
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| 8 | */ |
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| 9 | template<typename T> |
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| 10 | struct IsCallableImpl |
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| 11 | { |
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| 12 | private: |
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| 13 | typedef char(&yes)[1]; |
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| 14 | typedef char(&no)[2]; |
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| 15 | |
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| 16 | struct Fallback { void operator()(); }; |
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| 17 | struct Derived : T, Fallback { }; |
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| 18 | |
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| 19 | template<typename U, U> struct Check; |
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| 20 | |
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| 21 | template<typename> |
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| 22 | static yes test(...); |
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| 23 | |
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| 24 | template<typename C> |
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| 25 | static no test(Check<void (Fallback::*)(), &C::operator()>*); |
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| 26 | |
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| 27 | public: |
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| 28 | static const bool value = sizeof(test<Derived>(0)) == sizeof(yes); |
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| 29 | }; |
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| 30 | |
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| 31 | /** |
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| 32 | * @brief Checks if a type is callable |
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| 33 | * |
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| 34 | * Callable means here, that it has has an 'operator()'. This will not work for |
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| 35 | * normal functions without modifications, but we don't need that case anyway. |
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| 36 | * |
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| 37 | * See https://stackoverflow.com/a/15396757/7421666 |
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| 38 | */ |
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| 39 | template<typename T> |
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| 40 | struct IsCallable |
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| 41 | : std::conditional< |
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| 42 | std::is_class<T>::value, |
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| 43 | IsCallableImpl<T>, |
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| 44 | std::false_type |
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| 45 | >::type |
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| 46 | { }; |
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| 47 | |
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| 48 | #endif // IS_CALLABLE_H |
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