test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters/ios_base.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // <ostream>
  11
  12 // template <class charT, class traits = char_traits<charT> >
  13 //   class basic_ostream;
  14
  15 // basic_ostream<charT,traits>& operator<<(ios_base& (*pf)(ios_base&));
  16
  17 #include <ostream>
  18 #include <cassert>
  19
  20 template <class CharT>
  21 class testbuf
  22     : public std::basic_streambuf<CharT>
  23 {
  24     typedef std::basic_streambuf<CharT> base;
  25     std::basic_string<CharT> str_;
  26 public:
  27     testbuf()
  28     {
  29     }
  30
  31     std::basic_string<CharT> str() const
  32         {return std::basic_string<CharT>(base::pbase(), base::pptr());}
  33
  34 protected:
  35
  36     virtual typename base::int_type
  37         overflow(typename base::int_type __c = base::traits_type::eof())
  38         {
  39             if (__c != base::traits_type::eof())
  40             {
  41                 int n = static_cast<int>(str_.size());
  42                 str_.push_back(static_cast<CharT>(__c));
  43                 str_.resize(str_.capacity());
  44                 base::setp(const_cast<CharT*>(str_.data()),
  45                            const_cast<CharT*>(str_.data() + str_.size()));
  46                 base::pbump(n+1);
  47             }
  48             return __c;
  49         }
  50 };
  51
  52 int main()
  53 {
  54     {
  55         testbuf<char> sb;
  56         std::ostream os(&sb);
  57         assert(!(os.flags() & std::ios_base::uppercase));
  58         os << std::uppercase;
  59         assert( (os.flags() & std::ios_base::uppercase));
  60     }
  61 }