libcxx/test/std/containers/associative/map/map.access/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 // <map>
  10
  11 // class map
  12
  13 // size_type size() const;
  14
  15 #include <map>
  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::map<int, double> M;
  25     M m;
  26     assert(m.size() == 0);
  27     m.insert(M::value_type(2, 1.5));
  28     assert(m.size() == 1);
  29     m.insert(M::value_type(1, 1.5));
  30     assert(m.size() == 2);
  31     m.insert(M::value_type(3, 1.5));
  32     assert(m.size() == 3);
  33     m.erase(m.begin());
  34     assert(m.size() == 2);
  35     m.erase(m.begin());
  36     assert(m.size() == 1);
  37     m.erase(m.begin());
  38     assert(m.size() == 0);
  39     }
  40 #if TEST_STD_VER >= 11
  41     {
  42     typedef std::map<int, double, std::less<int>, min_allocator<std::pair<const int, double>>> M;
  43     M m;
  44     assert(m.size() == 0);
  45     m.insert(M::value_type(2, 1.5));
  46     assert(m.size() == 1);
  47     m.insert(M::value_type(1, 1.5));
  48     assert(m.size() == 2);
  49     m.insert(M::value_type(3, 1.5));
  50     assert(m.size() == 3);
  51     m.erase(m.begin());
  52     assert(m.size() == 2);
  53     m.erase(m.begin());
  54     assert(m.size() == 1);
  55     m.erase(m.begin());
  56     assert(m.size() == 0);
  57     }
  58 #endif
  59
  60   return 0;
  61 }