//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <utility>

// template <class T1, class T2> struct pair

// explicit(see-below) constexpr pair();

// NOTE: The SFINAE on the default constructor is tested in
//       default-sfinae.pass.cpp

#include <utility>
#include <type_traits>
#include <cassert>

#include "test_macros.h"
#include "archetypes.h"

int main(int, char**) {
  {
    typedef std::pair<float, short*> P;
    P p;
    assert(p.first == 0.0f);
    assert(p.second == nullptr);
  }
#if TEST_STD_VER >= 11
  {
    typedef std::pair<float, short*> P;
    constexpr P p;
    static_assert(p.first == 0.0f, "");
    static_assert(p.second == nullptr, "");
  }
  {
    using NoDefault = ImplicitTypes::NoDefault;
    using P         = std::pair<int, NoDefault>;
    static_assert(!std::is_default_constructible<P>::value, "");
    using P2 = std::pair<NoDefault, int>;
    static_assert(!std::is_default_constructible<P2>::value, "");
  }
  {
    struct Base {};
    struct Derived : Base {
    protected:
      Derived() = default;
    };
    static_assert(!std::is_default_constructible<std::pair<Derived, int> >::value, "");
  }
#endif

  return 0;
}