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Konstantin
44 lines
2.4 KiB
C++
44 lines
2.4 KiB
C++
#pragma once
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#include <type_traits>
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namespace ComLight
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{
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namespace details
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{
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template<class TResult, class TValue>
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constexpr bool pointersAssignable()
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{
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// See this for why `&` is required: https://stackoverflow.com/a/52429468/126995
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return std::is_assignable<TResult*&, TValue*>::value;
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}
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}
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}
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// https://en.wikibooks.org/wiki/More_C++_Idioms/Member_Detector
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#define GENERATE_HAS_MEMBER(member) \
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\
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template < class T > \
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class HasMember_##member \
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{ \
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private: \
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using Yes = char[2]; \
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using No = char[1]; \
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\
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struct Fallback { int member; }; \
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struct Derived : T, Fallback { }; \
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\
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template < class U > \
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static No& test ( decltype(U::member)* ); \
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template < typename U > \
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static Yes& test ( U* ); \
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\
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public: \
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static constexpr bool RESULT = sizeof(test<Derived>(nullptr)) == sizeof(Yes); \
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}; \
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\
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template < class T > \
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struct has_member_##member \
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: public std::integral_constant<bool, HasMember_##member<T>::RESULT> \
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{ \
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};
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