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Added class to identify EventHandlerObjects with template metaprogramming

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Vraiment 2017-07-31 00:37:19 -07:00
parent 6375e5f79a
commit 04e10e9788
2 changed files with 57 additions and 0 deletions
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1
CMakeLists.txt
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@ -159,6 +159,7 @@ SET(LIBRARY_HEADERS
SDL2pp/Wav.hh SDL2pp/Wav.hh
SDL2pp/Window.hh SDL2pp/Window.hh
SDL2pp/Private/EventHandlerFunctor.hh SDL2pp/Private/EventHandlerFunctor.hh
SDL2pp/Private/EventHandlerObject.hh
SDL2pp/Private/Utility.hh SDL2pp/Private/Utility.hh
) )

56
SDL2pp/Private/EventHandlerObject.hh Normal file
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@ -0,0 +1,56 @@
/*
libSDL2pp - C++11 bindings/wrapper for SDL2
Copyright (C) 2017 Vraiment <jemc44@gmail.com>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#ifndef SDL2PP_PRIVATE_EVENTHANDLEROBJECT_HH
#define SDL2PP_PRIVATE_EVENTHANDLEROBJECT_HH
#include <type_traits>
namespace SDL2pp {
/*
* This is code not to be used directly by users of SDL2pp.
*/
namespace Private {
/*
* Templated class to identify a class that is not an event handler object.
*/
template <typename, typename, typename = void>
struct IsEventHandlerObject : std::false_type { };
/*
* Templated class to identify a class that is an event handler object, the
* way this is done is by verifying that an instance of EventHandlerType has
* the "HandleEvent" member function which received a "const EventType &"
* and returns void.
*/
template <typename EventHandlerType, typename EventType>
struct IsEventHandlerObject<
EventHandlerType,
EventType,
std::is_same<
decltype(std::declval<EventHandlerType>().HandleEvent(std::declval<const EventType &>())),
void
>
> : std::true_type { };
}
}
#endif