libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.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 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_STRSTREAM
  10
  11 // <strstream>
  12
  13 // class strstreambuf
  14
  15 // explicit strstreambuf(streamsize alsize_arg = 0); // before C++20
  16 // strstreambuf() : strstreambuf(0) {}               // C++20
  17 // explicit strstreambuf(streamsize alsize_arg);     // C++20
  18
  19 #include <strstream>
  20 #include <cassert>
  21
  22 #include "test_macros.h"
  23 #if TEST_STD_VER >= 11
  24 #include "test_convertible.h"
  25 #endif
  26
  27 int main(int, char**)
  28 {
  29     {
  30         std::strstreambuf s;
  31         assert(s.str() == nullptr);
  32         assert(s.pcount() == 0);
  33     }
  34     {
  35         std::strstreambuf s(1024);
  36         LIBCPP_ASSERT(s.str() == nullptr);
  37         assert(s.pcount() == 0);
  38     }
  39
  40 #if TEST_STD_VER >= 11
  41     {
  42       typedef std::strstreambuf B;
  43       static_assert(test_convertible<B>(), "");
  44       static_assert(!test_convertible<B, std::streamsize>(), "");
  45     }
  46 #endif
  47
  48     return 0;
  49 }