detector.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <type_traits>
 
namespace LC
{
namespace Util
{
    namespace detail
    {
        template<typename Default, typename Placeholder, template<typename...> class Op, typename... Args>
        struct IsDetected
        {
            using value_t = std::false_type;
            using type = Default;
        };
 
        template<typename Default, template<typename...> class Op, typename... Args>
        struct IsDetected<Default, std::void_t<Op<Args...>>, Op, Args...>
        {
            using value_t = std::true_type;
            using type = Op<Args...>;
        };
    }
 
    template<template<typename...> class Op, typename... Args>
    constexpr bool IsDetected_v = detail::IsDetected<void, void, Op, Args...>::value_t::value;
 
    template<typename Type, template<typename...> class Op, typename... Args>
    using IsDetected_t = typename detail::IsDetected<Type, void, Op, Args...>::type;
}
}