libcxx/test/std/containers/container.adaptors/queue/queue.cons/ctor_default.pass.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <queue>
  10
  11 // explicit queue(Container&& = Container()); // before C++20
  12 // queue() : queue(Container()) {}            // C++20
  13 // explicit queue(Container&&);               // before C++20
  14
  15 #include <queue>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "test_allocator.h"
  20 #if TEST_STD_VER >= 11
  21 #include "test_convertible.h"
  22 #endif
  23
  24 int main(int, char**)
  25 {
  26     typedef std::vector<int, limited_allocator<int, 10> > Container;
  27     typedef std::queue<int, Container> Q;
  28     Q q;
  29     assert(q.size() == 0);
  30     q.push(1);
  31     q.push(2);
  32     assert(q.size() == 2);
  33     assert(q.front() == 1);
  34     assert(q.back() == 2);
  35
  36 #if TEST_STD_VER >= 11
  37     // It should be explicit, so not convertible before C++20.
  38     static_assert(test_convertible<Q>(), "");
  39 #endif
  40
  41     return 0;
  42 }