IsInvocable.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Templates/Invoke.h"
 
namespace UE::Core::Private::IsInvocable
{
    template <typename T>
    T&& DeclVal();
 
    template <typename T>
    struct TVoid
    {
        typedef void Type;
    };
 
    template <typename, typename CallableType, typename... ArgTypes>
    struct TIsInvocableImpl
    {
        enum { Value = false };
    };
 
    template <typename CallableType, typename... ArgTypes>
    struct TIsInvocableImpl<typename TVoid<decltype(Invoke(DeclVal<CallableType>(), DeclVal<ArgTypes>()...))>::Type, CallableType, ArgTypes...>
    {
        enum { Value = true };
    };
}
 
template <typename CallableType, typename... ArgTypes>
struct TIsInvocable : UE::Core::Private::IsInvocable::TIsInvocableImpl<void, CallableType, ArgTypes...>
{
};