mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 08:32:02 +00:00
35 lines
781 B
C++
35 lines
781 B
C++
#pragma once
|
|
|
|
#include "TypeList.h"
|
|
|
|
namespace detail
|
|
{
|
|
template <class T>
|
|
struct FnTraits { template <class> static constexpr bool value = false; };
|
|
|
|
template <class R, class ...A>
|
|
struct FnTraits<R(A...)>
|
|
{
|
|
template <class F>
|
|
static constexpr bool value = std::is_invocable_r_v<R, F, A...>;
|
|
|
|
using Ret = R;
|
|
using Args = TypeList<A...>;
|
|
};
|
|
|
|
template <class R, class ...A>
|
|
struct FnTraits<R(*)(A...)> : FnTraits<R(A...)> {};
|
|
}
|
|
|
|
template <class T> using FnTraits = detail::FnTraits<T>;
|
|
|
|
/**
|
|
* A less-typing alias for std::is_invokable_r_v.
|
|
* @example void foo(Fn<bool(int, char)> auto && functor)
|
|
*/
|
|
template <class F, class FS>
|
|
concept Fn = FnTraits<FS>::template value<F>;
|
|
|
|
template <auto Value>
|
|
using Constant = std::integral_constant<decltype(Value), Value>;
|