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is_constructible #538

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18 changes: 17 additions & 1 deletion Plugins/UnLua/Source/UnLua/Public/UnLuaTemplate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -20,10 +20,26 @@
namespace UnLua
{

/**
* Reference
* 1.https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94003
* 2.https://codereview.stackexchange.com/questions/273221/an-rough-implementation-of-stdis-constructible
*/
template<class, class T, class... Args>
struct is_constructible_impl : std::false_type {};

template<class T, class... Args>
struct is_constructible_impl<decltype((
new T(std::declval<Args>()...)
), void()), T, Args...> : std::true_type {};

template<class T, class... Args>
struct is_constructible : is_constructible_impl<void, T, Args...> {};

/**
* Traits class which tests if a type is constructible
*/
template <class T, class... Args> struct TIsConstructible { enum { Value = std::is_constructible<T, Args...>::value }; };
template <class T, class... Args> struct TIsConstructible { enum { Value = is_constructible<T, Args...>::value }; };
template <class T> struct TIsCopyConstructible { enum { Value = std::is_copy_constructible<T>::value }; };
template <class T> struct TIsDestructible { enum { Value = std::is_destructible<T>::value }; };

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