libcxx/test/std/containers/sequences/vector/vector.cons/default_noexcept.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 // UNSUPPORTED: c++03
   9
  10 // <vector>
  11
  12 // vector()
  13 //        noexcept(is_nothrow_default_constructible<allocator_type>::value);
  14
  15 // This *was* a conforming extension, but it was adopted in N4258.
  16
  17
  18 #include <vector>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "MoveOnly.h"
  23 #include "test_allocator.h"
  24
  25 template <class T>
  26 struct some_alloc
  27 {
  28     typedef T value_type;
  29     some_alloc(const some_alloc&);
  30     void allocate(std::size_t);
  31 };
  32
  33 TEST_CONSTEXPR_CXX20 bool tests() {
  34     {
  35         typedef std::vector<MoveOnly> C;
  36         static_assert(std::is_nothrow_default_constructible<C>::value, "");
  37     }
  38     {
  39         typedef std::vector<MoveOnly, test_allocator<MoveOnly>> C;
  40         static_assert(std::is_nothrow_default_constructible<C>::value, "");
  41     }
  42     {
  43         typedef std::vector<MoveOnly, other_allocator<MoveOnly>> C;
  44         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
  45     }
  46     {
  47         typedef std::vector<MoveOnly, some_alloc<MoveOnly>> C;
  48         static_assert(!std::is_nothrow_default_constructible<C>::value, "");
  49     }
  50
  51     return true;
  52 }
  53
  54 int main(int, char**)
  55 {
  56     tests();
  57 #if TEST_STD_VER > 17
  58     static_assert(tests());
  59 #endif
  60     return 0;
  61 }