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57 lines
1.5 KiB
C++
57 lines
1.5 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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// <utility>
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// template <class T1, class T2> struct pair
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// constexpr pair();
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// This test doesn't pass due to a constexpr bug in GCC 4.9 that fails
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// to initialize any type without a user provided constructor in a constant
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// expression (e.g. float).
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// XFAIL: gcc-4.9
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// NOTE: The SFINAE on the default constructor is tested in
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// default-sfinae.pass.cpp
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#include <utility>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "archetypes.hpp"
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int main(int, char**)
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{
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{
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typedef std::pair<float, short*> P;
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P p;
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assert(p.first == 0.0f);
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assert(p.second == nullptr);
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}
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#if TEST_STD_VER >= 11
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{
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typedef std::pair<float, short*> P;
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constexpr P p;
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static_assert(p.first == 0.0f, "");
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static_assert(p.second == nullptr, "");
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}
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{
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using NoDefault = ImplicitTypes::NoDefault;
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using P = std::pair<int, NoDefault>;
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static_assert(!std::is_default_constructible<P>::value, "");
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using P2 = std::pair<NoDefault, int>;
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static_assert(!std::is_default_constructible<P2>::value, "");
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}
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#endif
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return 0;
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}
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