libcxx/test/std/strings/basic.string/string.capacity/clear.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 // <string>
  10
  11 // void clear();
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "min_allocator.h"
  18
  19 template <class S>
  20 void
  21 test(S s)
  22 {
  23     s.clear();
  24     assert(s.size() == 0);
  25 }
  26
  27 int main(int, char**)
  28 {
  29     {
  30     typedef std::string S;
  31     S s;
  32     test(s);
  33
  34     s.assign(10, 'a');
  35     s.erase(5);
  36     test(s);
  37
  38     s.assign(100, 'a');
  39     s.erase(50);
  40     test(s);
  41     }
  42 #if TEST_STD_VER >= 11
  43     {
  44     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
  45     S s;
  46     test(s);
  47
  48     s.assign(10, 'a');
  49     s.erase(5);
  50     test(s);
  51
  52     s.assign(100, 'a');
  53     s.erase(50);
  54     test(s);
  55     }
  56 #endif
  57
  58   return 0;
  59 }