libcxx/test/std/containers/sequences/vector/vector.capacity/empty.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 // <vector>
  10
  11 // class vector
  12
  13 // bool empty() const noexcept;
  14
  15 #include <vector>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 TEST_CONSTEXPR_CXX20 bool tests() {
  22     {
  23     typedef std::vector<int> C;
  24     C c;
  25     ASSERT_NOEXCEPT(c.empty());
  26     assert(c.empty());
  27     c.push_back(C::value_type(1));
  28     assert(!c.empty());
  29     c.clear();
  30     assert(c.empty());
  31     }
  32 #if TEST_STD_VER >= 11
  33     {
  34     typedef std::vector<int, min_allocator<int>> C;
  35     C c;
  36     ASSERT_NOEXCEPT(c.empty());
  37     assert(c.empty());
  38     c.push_back(C::value_type(1));
  39     assert(!c.empty());
  40     c.clear();
  41     assert(c.empty());
  42     }
  43     {
  44       typedef std::vector<int, safe_allocator<int>> C;
  45       C c;
  46       ASSERT_NOEXCEPT(c.empty());
  47       assert(c.empty());
  48       c.push_back(C::value_type(1));
  49       assert(!c.empty());
  50       c.clear();
  51       assert(c.empty());
  52     }
  53 #endif
  54
  55     return true;
  56 }
  57
  58 int main(int, char**)
  59 {
  60     tests();
  61 #if TEST_STD_VER > 17
  62     static_assert(tests());
  63 #endif
  64     return 0;
  65 }