blob: be9261a5c55c21b0c3703fca394b88e62094663c [file] [log] [blame]
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
// <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&() noexcept(IsNothrow) { return val; }
};
struct convertible_from_int {
convertible_from_int(int) {}
};
void meow(std::reference_wrapper<int>) {}
void meow(convertible_from_int) {}
int gi;
std::reference_wrapper<int> purr() { return gi; };
template <class T>
void
test(T& t)
{
std::reference_wrapper<T> r(t);
assert(&r.get() == &t);
}
void f() {}
int main(int, char**)
{
convertible_to_int_ref convi;
test(convi);
convertible_to_int_ref const convic;
test(convic);
{
using Ref = std::reference_wrapper<int>;
static_assert((std::is_nothrow_constructible<Ref, nothrow_convertible<true>>::value), "");
static_assert((!std::is_nothrow_constructible<Ref, nothrow_convertible<false>>::value), "");
}
{
meow(0);
(true) ? purr() : 0;
}
#if TEST_STD_VER >= 17
{
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;
}