libcxx/test/std/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.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 // <istream>
  10
  11 // template <class charT, class traits = char_traits<charT> >
  12 // class basic_istream;
  13
  14 // explicit basic_istream(basic_streambuf<charT,traits>* sb);
  15
  16 #include <istream>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 template <class CharT>
  22 struct testbuf
  23     : public std::basic_streambuf<CharT>
  24 {
  25     testbuf() {}
  26 };
  27
  28 int main(int, char**)
  29 {
  30     {
  31         testbuf<char> sb;
  32         std::basic_istream<char> is(&sb);
  33         assert(is.rdbuf() == &sb);
  34         assert(is.tie() == 0);
  35         assert(is.fill() == ' ');
  36         assert(is.rdstate() == is.goodbit);
  37         assert(is.exceptions() == is.goodbit);
  38         assert(is.flags() == (is.skipws | is.dec));
  39         assert(is.precision() == 6);
  40         assert(is.getloc().name() == "C");
  41         assert(is.gcount() == 0);
  42     }
  43 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  44     {
  45         testbuf<wchar_t> sb;
  46         std::basic_istream<wchar_t> is(&sb);
  47         assert(is.rdbuf() == &sb);
  48         assert(is.tie() == 0);
  49         assert(is.fill() == L' ');
  50         assert(is.rdstate() == is.goodbit);
  51         assert(is.exceptions() == is.goodbit);
  52         assert(is.flags() == (is.skipws | is.dec));
  53         assert(is.precision() == 6);
  54         assert(is.getloc().name() == "C");
  55         assert(is.gcount() == 0);
  56     }
  57 #endif
  58
  59   return 0;
  60 }