libcxx/test/std/strings/basic.string/string.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 // <string>
  10
  11 // bool empty() const noexcept;
  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(const S& s)
  22 {
  23     ASSERT_NOEXCEPT(s.empty());
  24     assert(s.empty() == (s.size() == 0));
  25 }
  26
  27 int main(int, char**)
  28 {
  29     {
  30     typedef std::string S;
  31     test(S());
  32     test(S("123"));
  33     test(S("12345678901234567890123456789012345678901234567890"));
  34     }
  35 #if TEST_STD_VER >= 11
  36     {
  37     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
  38     test(S());
  39     test(S("123"));
  40     test(S("12345678901234567890123456789012345678901234567890"));
  41     }
  42 #endif
  43
  44   return 0;
  45 }