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// Copyright (C) 2017 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-options "-std=gnu++17" }
// { dg-do compile { target c++1z } }
#include <mutex>
template<typename T, typename U> struct require_same;
template<typename T> struct require_same<T, T> { using type = void; };
template<typename T, typename U>
typename require_same<T, U>::type
check_type(U&) { }
void
test01()
{
std::scoped_lock l0;
check_type<std::scoped_lock<>>(l0);
struct BasicLockable {
void lock() { }
void unlock() { }
} m1;
std::scoped_lock l1(m1);
check_type<std::scoped_lock<BasicLockable>>(l1);
struct Lockable {
void lock() { }
void unlock() { }
bool try_lock() { return true; }
} m2;
std::mutex m3;
std::scoped_lock l2(m2, m3);
check_type<std::scoped_lock<Lockable, std::mutex>>(l2);
}
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