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Added enable_if for the EventHandler templates

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This commit is contained in:
Vraiment 2017-08-05 16:39:02 -07:00
parent a52074324e
commit ab48a57a40
3 changed files with 24 additions and 12 deletions
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4
SDL2pp/Private/EventHandler.hh
View File

@ -91,13 +91,15 @@ namespace Private {
struct IsEventHandler<
EventHandlerType,
EventType,
typename std::enable_if<
And<
Or<
IsEventHandlerObject<EventHandlerType, EventType>,
IsEventHandlerFunctor<EventHandlerType, EventType>
>,
TupleHasType<EventType, ValidEventTypes>
>
>::value
>::type
> : std::true_type { };
}
}

4
SDL2pp/Private/EventHandlerFunctor.hh
View File

@ -52,7 +52,9 @@ namespace Private {
struct IsEventHandlerFunctor<
EventHandlerType,
EventType,
std::is_convertible<EventHandlerType, EventHandlerFunctorSignature<EventType>>
typename std::enable_if<
std::is_convertible<EventHandlerType, EventHandlerFunctorSignature<EventType>>::value
>::type
> : std::true_type { };
}
}

16
SDL2pp/Private/EventHandlerObject.hh
View File

@ -29,6 +29,15 @@ namespace SDL2pp {
* This is code not to be used directly by users of SDL2pp.
*/
namespace Private {
/*
* Templated class to detect if a given type can handle a given event.
*/
template <typename EventHandlerType, typename EventType>
struct HasEventHandlerMethod : std::is_same<
decltype(std::declval<EventHandlerType>().HandleEvent(std::declval<const EventType &>())),
void
> { };
/*
* Templated class to identify a class that is not an event handler object.
*/
@ -45,10 +54,9 @@ namespace Private {
struct IsEventHandlerObject<
EventHandlerType,
EventType,
std::is_same<
decltype(std::declval<EventHandlerType>().HandleEvent(std::declval<const EventType &>())),
void
>
typename std::enable_if<
HasEventHandlerMethod<EventHandlerType, EventType>::value
>::type
> : std::true_type { };
}
}