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// Copyright 2015, Tobias Hermann and the FunctionalPlus contributors.
// https://github.com/Dobiasd/FunctionalPlus
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#include <fplus/internal/invoke.hpp>
#include <fplus/function_traits.hpp>
namespace fplus
{
namespace internal
{
template <typename T, typename...>
struct function_traits_asserts;
template <
typename,
typename F,
typename... Args,
typename std::enable_if<is_invocable<F, Args...>::value, int>::type = 0>
constexpr void trigger_static_asserts()
{
}
// Marks a variable as unused. Prevents the compiler warning
// for set but unused variables.
template<class T>
inline void unused(T&&) { }
template <typename Tag,
typename F,
typename... Args,
typename std::enable_if<has_function_traits<F>::value &&
!is_invocable<F, Args...>::value,
int>::type = 0>
constexpr void trigger_static_asserts()
{
// don't perform checks if function_traits<F> doesn't exist
unused(function_traits_asserts<Tag, F, Args...>{});
}
template <typename,
typename F,
typename... Args,
typename std::enable_if<!has_function_traits<F>::value &&
!is_invocable<F, Args...>::value,
int>::type = 0>
constexpr void trigger_static_asserts()
{
static_assert(sizeof(F) == 0,
"F is not a Callable, or its definition is ill-formed");
}
}
}
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