libcxx/test/std/input.output/string.streams/ostringstream/ostringstream.members/str.move.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // <sstream>
  12
  13 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>
  14 // class basic_ostringstream
  15
  16 // basic_string<charT, traits, Allocator> str() &&;
  17
  18 #include <sstream>
  19 #include <cassert>
  20
  21 #include "make_string.h"
  22 #include "test_macros.h"
  23
  24 #define STR(S) MAKE_STRING(CharT, S)
  25
  26 template <class CharT>
  27 static void test() {
  28   {
  29     std::basic_ostringstream<CharT> ss(STR("testing"));
  30     std::basic_string<CharT> s = std::move(ss).str();
  31     assert(s == STR("testing"));
  32     assert(ss.view().empty());
  33   }
  34   {
  35     std::basic_ostringstream<CharT> ss;
  36     std::basic_string<CharT> s = std::move(ss).str();
  37     assert(s.empty());
  38     assert(ss.view().empty());
  39   }
  40   {
  41     std::basic_ostringstream<CharT> ss(
  42         STR("a very long string that exceeds the small string optimization buffer length"));
  43     const CharT* p             = ss.view().data();
  44     std::basic_string<CharT> s = std::move(ss).str();
  45     assert(s.data() == p); // the allocation was pilfered
  46     assert(ss.view().empty());
  47   }
  48 }
  49
  50 int main(int, char**) {
  51   test<char>();
  52 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  53   test<wchar_t>();
  54 #endif
  55   return 0;
  56 }