sdl_traits.h

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#pragma once
 
#include "SDL/sdl_fwd.h"
#include "SDL/ESdlTypeCategory.h"
#include "Utility/traits.h"
 
#include <type_traits>
 
namespace ph
{
 
template<typename T>
concept CSdlResource = CDerived<T, ISdlResource>;
 
template<typename T>
concept CHasStaticSdlCategoryInfo = 
    CSdlResource<T> &&
    // Check equality of types with cv removed just to be robust
    // (in case the implementer qualifies the `CATEGORY` member).
    std::is_same_v<std::remove_cv_t<decltype(T::CATEGORY)>, ESdlTypeCategory>;
 
template<typename T>
concept CHasSdlClassDefinition = 
    CSdlResource<T> &&
    std::is_same_v<typename T::SdlClassDefinitionMarker, std::remove_cv_t<T>>;
 
template<typename T>
concept CHasSdlStructDefinition =
    std::is_same_v<typename T::SdlStructDefinitionMarker, std::remove_cv_t<T>>;
 
template<typename T>
concept CHasSdlFunctionDefinition =
    std::is_same_v<typename T::SdlFunctionDefinitionMarker, std::remove_cv_t<T>>;
 
template<typename EnumType>
concept CHasSdlEnumDefinition =
    CEnum<EnumType> &&
    std::is_same_v<
        typename TSdlEnum<std::remove_cv_t<EnumType>>::SdlEnumDefinitionMarker,
        std::remove_cv_t<EnumType>>;
 
template<typename T>
concept CSdlInstance = 
    CSdlResource<T> ||
    CHasSdlStructDefinition<T> ||
    CHasSdlFunctionDefinition<T>;
 
template<typename T>
concept CSdlStructSupportsInitToDefault = CHasSdlStructDefinition<T> && requires (T instance)
{
    T::getSdlStruct()->initDefaultStruct(instance);
};
 
}// end namespace ph