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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
/*
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libSDL2pp - C++11 bindings/wrapper for SDL2
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Copyright (C) 2017 Vraiment <jemc44@gmail.com>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef SDL2PP_PRIVATE_EVENTHANDLERFUNCTOR_HH
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#define SDL2PP_PRIVATE_EVENTHANDLERFUNCTOR_HH
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#include <functional>
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#include <type_traits>
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namespace SDL2pp {
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/*
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* This is code not to be used directly by users of SDL2pp.
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*/
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namespace Private {
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/*
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* Helper alias to help identify a functor object with the correct signature
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* to be used as an event handler.
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*/
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template <typename EventType>
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using EventHandlerFunctorSignature = std::function<void(const EventType &)>;
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/*
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* Templated class to identify a class that is not an event handler functor.
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*/
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template <typename, typename, typename = void>
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struct IsEventHandlerFunctor : std::false_type { };
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/*
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* Templated class to identify a class that is an event handler functor, the
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* way this is done is by verifying if the functor is assignable to the
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* expected signature.
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*/
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template <typename EventHandlerType, typename EventType>
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struct IsEventHandlerFunctor<
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EventHandlerType,
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EventType,
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typename std::enable_if<
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std::is_convertible<EventHandlerType, EventHandlerFunctorSignature<EventType>>::value
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>::type
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> : std::true_type { };
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}
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}
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#endif
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