52 lines
1.9 KiB
C++
52 lines
1.9 KiB
C++
/*
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* Copyright 2015-2020 Michele "King_DuckZ" Santullo
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#define define_has_method(method_name,pretty_name) \
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template <typename T> \
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struct Has ## pretty_name ## Method { \
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private: \
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struct TrueType { int a[2]; }; \
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typedef int FalseType; \
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template <typename C> static TrueType has_method ( decltype(&C::method_name) ); \
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template <typename C> static FalseType has_method ( ... ); \
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public: \
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enum { value = sizeof(has_method<T>(0)) == sizeof(TrueType) }; \
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}
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#define define_has_typedef(typedef_name,pretty_name) \
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template <typename T> \
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struct Has ## pretty_name ## Typedef { \
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private: \
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struct TrueType { int a[2]; }; \
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typedef int FalseType; \
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template <typename C> static TrueType has_typedef ( const typename C::typedef_name* ); \
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template <typename C> static FalseType has_typedef ( ... ); \
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public: \
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enum { value = sizeof(has_typedef<T>(nullptr)) == sizeof(TrueType) }; \
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}
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#define define_has_enum(enum_name,pretty_name) \
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template <typename T> \
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struct Has ## pretty_name ## Enum { \
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private: \
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struct TrueType { int a[2]; }; \
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typedef int FalseType; \
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template <typename C> static TrueType has_enum ( decltype(C::enum_name)* ); \
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template <typename C> static FalseType has_enum ( ... ); \
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public:\
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enum { value = sizeof(has_enum<T>(nullptr)) == sizeof(TrueType) }; \
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}
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