libcxx/test/std/containers/unord/unord.set/size.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 // <unordered_set>
  10
  11 // class unordered_set
  12
  13 // size_type size() const noexcept;
  14
  15 #include <unordered_set>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 int main(int, char**)
  22 {
  23     {
  24     typedef std::unordered_set<int> M;
  25     M m;
  26     ASSERT_NOEXCEPT(m.size());
  27     assert(m.size() == 0);
  28     m.insert(M::value_type(2));
  29     assert(m.size() == 1);
  30     m.insert(M::value_type(1));
  31     assert(m.size() == 2);
  32     m.insert(M::value_type(3));
  33     assert(m.size() == 3);
  34     m.erase(m.begin());
  35     assert(m.size() == 2);
  36     m.erase(m.begin());
  37     assert(m.size() == 1);
  38     m.erase(m.begin());
  39     assert(m.size() == 0);
  40     }
  41 #if TEST_STD_VER >= 11
  42     {
  43     typedef std::unordered_set<int, std::hash<int>, std::equal_to<int>, min_allocator<int>> M;
  44     M m;
  45     ASSERT_NOEXCEPT(m.size());
  46     assert(m.size() == 0);
  47     m.insert(M::value_type(2));
  48     assert(m.size() == 1);
  49     m.insert(M::value_type(1));
  50     assert(m.size() == 2);
  51     m.insert(M::value_type(3));
  52     assert(m.size() == 3);
  53     m.erase(m.begin());
  54     assert(m.size() == 2);
  55     m.erase(m.begin());
  56     assert(m.size() == 1);
  57     m.erase(m.begin());
  58     assert(m.size() == 0);
  59     }
  60 #endif
  61
  62   return 0;
  63 }