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//===----------------------------------------------------------------------===//
//
// 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
// reference_wrapper& operator=(const reference_wrapper<T>& x);
#include <functional>
#include <cassert>
#include "test_macros.h"
class functor1
{
};
struct convertible_to_int_ref {
int val = 0;
operator int&() { return val; }
operator int const&() const { return val; }
};
template <class T>
void
test(T& t)
{
std::reference_wrapper<T> r(t);
T t2 = t;
std::reference_wrapper<T> r2(t2);
r2 = r;
assert(&r2.get() == &t);
}
void f() {}
void g() {}
void
test_function()
{
std::reference_wrapper<void ()> r(f);
std::reference_wrapper<void ()> r2(g);
r2 = r;
assert(&r2.get() == &f);
}
int main(int, char**)
{
void (*fp)() = f;
test(fp);
test_function();
functor1 f1;
test(f1);
int i = 0;
test(i);
const int j = 0;
test(j);
#if TEST_STD_VER >= 11
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_assignable<Ref&, int&>::value), "");
static_assert((!std::is_assignable<Ref&, int>::value), "");
static_assert((!std::is_assignable<Ref&, int&&>::value), "");
}
#endif
return 0;
}
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