libcxx/test/std/input.output/iostreams.base/std.ios.manip/fmtflags.manip/nounitbuf.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 // <ios>
  10
  11 // class ios_base
  12
  13 // ios_base& nounitbuf(ios_base& str);
  14
  15 #include <ios>
  16 #include <streambuf>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 struct testbuf : public std::streambuf {};
  22
  23 int main(int, char**)
  24 {
  25     testbuf sb;
  26     std::ios ios(&sb);
  27     std::unitbuf(ios);
  28     std::ios_base& r = std::nounitbuf(ios);
  29     assert(&r == &ios);
  30     assert(!(ios.flags() & std::ios::unitbuf));
  31
  32   return 0;
  33 }