58 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <utility>10 11// template <class T1, class T2> struct pair12 13// explicit(see-below) constexpr pair();14 15// NOTE: The SFINAE on the default constructor is tested in16// default-sfinae.pass.cpp17 18#include <utility>19#include <type_traits>20#include <cassert>21 22#include "test_macros.h"23#include "archetypes.h"24 25int main(int, char**) {26 {27 typedef std::pair<float, short*> P;28 P p;29 assert(p.first == 0.0f);30 assert(p.second == nullptr);31 }32#if TEST_STD_VER >= 1133 {34 typedef std::pair<float, short*> P;35 constexpr P p;36 static_assert(p.first == 0.0f, "");37 static_assert(p.second == nullptr, "");38 }39 {40 using NoDefault = ImplicitTypes::NoDefault;41 using P = std::pair<int, NoDefault>;42 static_assert(!std::is_default_constructible<P>::value, "");43 using P2 = std::pair<NoDefault, int>;44 static_assert(!std::is_default_constructible<P2>::value, "");45 }46 {47 struct Base {};48 struct Derived : Base {49 protected:50 Derived() = default;51 };52 static_assert(!std::is_default_constructible<std::pair<Derived, int> >::value, "");53 }54#endif55 56 return 0;57}58