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// Copyright (C) 2019-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do compile { target c++20 } }
#include <concepts>
static_assert( ! std::invocable<int> );
static_assert( std::invocable<int()> );
static_assert( std::invocable<int(*)()> );
static_assert( std::invocable<int(&)()> );
static_assert( ! std::invocable<int(), int> );
static_assert( ! std::invocable<int() const> );
static_assert( std::invocable<int(const long*, short), long*, char> );
struct A;
static_assert( std::invocable<int A::*, const A&> );
static_assert( ! std::invocable<void (A::*)(long&), const A*, long&> );
static_assert( std::invocable<void (A::*)(long&) const, A*, long&> );
struct F
{
void operator()() const;
void operator()(int);
};
static_assert( std::invocable<F> );
static_assert( std::invocable<F, int> );
static_assert( std::invocable<const F&> );
static_assert( ! std::invocable<const F&, int> );
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