49 lines
2.9 KiB
C++
49 lines
2.9 KiB
C++
# pragma once
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# include <imgui.h>
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# include <type_traits>
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// https://stackoverflow.com/a/8597498
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# define DECLARE_HAS_NESTED(Name, Member) \
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\
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template<class T> \
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struct has_nested_ ## Name \
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{ \
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typedef char yes; \
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typedef yes(&no)[2]; \
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\
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template<class U> static yes test(decltype(U::Member)*); \
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template<class U> static no test(...); \
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\
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static bool const value = sizeof(test<T>(0)) == sizeof(yes); \
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};
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# define DECLARE_KEY_TESTER(Key) \
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DECLARE_HAS_NESTED(Key, Key) \
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struct KeyTester_ ## Key \
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{ \
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template <typename T> \
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static int Get(typename std::enable_if<has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
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{ \
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return T::Key; \
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} \
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\
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template <typename T> \
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static int Get(typename std::enable_if<!has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
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{ \
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return -1; \
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} \
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}
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DECLARE_KEY_TESTER(ImGuiKey_F);
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DECLARE_KEY_TESTER(ImGuiKey_D);
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static inline int GetEnumValueForF()
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{
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return KeyTester_ImGuiKey_F::Get<ImGuiKey_>(nullptr);
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}
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static inline int GetEnumValueForD()
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{
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return KeyTester_ImGuiKey_D::Get<ImGuiKey_>(nullptr);
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}
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