109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2021 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_OVERLOAD_INCLUDED
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#define ETL_OVERLOAD_INCLUDED
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#include "platform.h"
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#include "utility.h"
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#include "type_traits.h"
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namespace etl
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{
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#if ETL_USING_CPP17
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//*************************************************************************
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/// Variadic template definition of overload for C++17 and above.
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//*************************************************************************
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template<typename... TOverloads>
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struct overload : TOverloads...
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{
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using TOverloads::operator()...;
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};
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//*************************************************************************
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/// Template deduction guide.
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//*************************************************************************
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template<typename... TOverloads> overload(TOverloads...)->overload<TOverloads...>;
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//*************************************************************************
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/// Make an overload.
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//*************************************************************************
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template <typename... TOverloads>
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constexpr overload<TOverloads...> make_overload(TOverloads&&... overloads)
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{
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return overload<TOverloads...>{ etl::forward<TOverloads>(overloads)... };
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}
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#elif ETL_USING_CPP11
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//*************************************************************************
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/// Variadic template definition of overload for C++11 & C++14.
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//*************************************************************************
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template <typename... TRest>
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struct overload;
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//*************************************************************************
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/// Specialisation for multiple overloads.
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//*************************************************************************
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template <typename TOverload, typename... TRest>
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struct overload<TOverload, TRest...> : TOverload, overload<TRest...>
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{
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overload(TOverload first, TRest... rest) : TOverload(first), overload<TRest...>(rest...)
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{
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}
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using TOverload::operator();
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using overload<TRest...>::operator();
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};
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//*************************************************************************
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/// Specialisation for one overload.
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//*************************************************************************
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template <typename TOverload>
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struct overload<TOverload> : TOverload
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{
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overload(TOverload first) : TOverload(first)
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{
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}
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using TOverload::operator();
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};
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//*************************************************************************
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/// Make an overload.
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//*************************************************************************
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template <typename... TRest>
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overload<TRest...> make_overload(TRest... overloads)
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{
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return overload<TRest...>(overloads...);
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}
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#endif
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}
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#endif
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