forked from OSchip/llvm-project
68 lines
1.4 KiB
C++
68 lines
1.4 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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// template <ObjectType T> reference_wrapper<T> ref(reference_wrapper<T> t);
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#include <functional>
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#include <cassert>
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#include "counting_predicates.h"
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#include "test_macros.h"
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bool is5 ( int i ) { return i == 5; }
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template <typename T>
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bool call_pred ( T pred ) { return pred(5); }
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namespace adl {
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struct A {};
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void ref(A) {}
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}
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TEST_CONSTEXPR_CXX20 bool test()
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{
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{
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int i = 0;
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std::reference_wrapper<int> r1 = std::ref(i);
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std::reference_wrapper<int> r2 = std::ref(r1);
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assert(&r2.get() == &i);
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}
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{
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adl::A a;
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std::reference_wrapper<adl::A> a1 = std::ref(a);
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std::reference_wrapper<adl::A> a2 = std::ref(a1);
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assert(&a2.get() == &a);
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}
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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{
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unary_counting_predicate<bool(*)(int), int> cp(is5);
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assert(!cp(6));
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assert(cp.count() == 1);
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assert(call_pred(cp));
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assert(cp.count() == 1);
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assert(call_pred(std::ref(cp)));
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assert(cp.count() == 2);
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}
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return 0;
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}
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