//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <functional>
//
// reference_wrapper
//
// template <class U>
// reference_wrapper(U&&) noexcept(see below);
#include <functional>
#include <cassert>
#include "test_macros.h"
struct convertible_to_int_ref {
int val = 0;
operator int&() { return val; }
operator int const&() const { return val; }
};
template <bool IsNothrow>
struct nothrow_convertible {
int val = 0;
operator int&() TEST_NOEXCEPT_COND(IsNothrow) { return val; }
};
struct convertible_from_int {
convertible_from_int(int) {}
};
void meow(std::reference_wrapper<int>) {}
void meow(convertible_from_int) {}
std::reference_wrapper<int> purr();
int main(int, char**) {
{
convertible_to_int_ref t;
std::reference_wrapper<convertible_to_int_ref> r(t);
assert(&r.get() == &t);
}
{
const convertible_to_int_ref t;
std::reference_wrapper<const convertible_to_int_ref> r(t);
assert(&r.get() == &t);
}
{
using Ref = std::reference_wrapper<int>;
ASSERT_NOEXCEPT(Ref(nothrow_convertible<true>()));
ASSERT_NOT_NOEXCEPT(Ref(nothrow_convertible<false>()));
}
meow(0);
ASSERT_SAME_TYPE(decltype(true ? purr() : 0), int);
#if TEST_STD_VER > 14
{
int i = 0;
std::reference_wrapper ri(i);
static_assert((std::is_same<decltype(ri), std::reference_wrapper<int>>::value), "");
}
{
const int j = 0;
std::reference_wrapper rj(j);
static_assert((std::is_same<decltype(rj), std::reference_wrapper<const int>>::value), "");
}
#endif
return 0;
}