81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// reference_wrapper
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// reference_wrapper& operator=(const reference_wrapper<T>& x);
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#include <functional>
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#include <cassert>
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#include "test_macros.h"
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class functor1
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{
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};
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struct convertible_to_int_ref {
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int val = 0;
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operator int&() { return val; }
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operator int const&() const { return val; }
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};
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template <class T>
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void
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test(T& t)
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{
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std::reference_wrapper<T> r(t);
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T t2 = t;
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std::reference_wrapper<T> r2(t2);
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r2 = r;
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assert(&r2.get() == &t);
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}
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void f() {}
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void g() {}
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void
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test_function()
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{
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std::reference_wrapper<void ()> r(f);
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std::reference_wrapper<void ()> r2(g);
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r2 = r;
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assert(&r2.get() == &f);
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}
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int main(int, char**)
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{
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void (*fp)() = f;
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test(fp);
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test_function();
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functor1 f1;
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test(f1);
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int i = 0;
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test(i);
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const int j = 0;
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test(j);
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#if TEST_STD_VER >= 11
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convertible_to_int_ref convi;
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test(convi);
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convertible_to_int_ref const convic;
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test(convic);
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{
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using Ref = std::reference_wrapper<int>;
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static_assert((std::is_assignable<Ref&, int&>::value), "");
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static_assert((!std::is_assignable<Ref&, int>::value), "");
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static_assert((!std::is_assignable<Ref&, int&&>::value), "");
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}
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#endif
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return 0;
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}
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