test/std/input.output/iostream.format/output.streams/ostream.formatted/ostream.inserters.character/signed_char.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 // template<class char, class traits>
  16 //   basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out, signed char c);
  17
  18 #include <ostream>
  19 #include <cassert>
  20
  21 template <class CharT>
  22 class testbuf
  23     : public std::basic_streambuf<CharT>
  24 {
  25     typedef std::basic_streambuf<CharT> base;
  26     std::basic_string<CharT> str_;
  27 public:
  28     testbuf()
  29     {
  30     }
  31
  32     std::basic_string<CharT> str() const
  33         {return std::basic_string<CharT>(base::pbase(), base::pptr());}
  34
  35 protected:
  36
  37     virtual typename base::int_type
  38         overflow(typename base::int_type ch = base::traits_type::eof())
  39         {
  40             if (ch != base::traits_type::eof())
  41             {
  42                 int n = static_cast<int>(str_.size());
  43                 str_.push_back(static_cast<CharT>(ch));
  44                 str_.resize(str_.capacity());
  45                 base::setp(const_cast<CharT*>(str_.data()),
  46                            const_cast<CharT*>(str_.data() + str_.size()));
  47                 base::pbump(n+1);
  48             }
  49             return ch;
  50         }
  51 };
  52
  53 int main()
  54 {
  55     {
  56         std::ostream os((std::streambuf*)0);
  57         signed char c = 'a';
  58         os << c;
  59         assert(os.bad());
  60         assert(os.fail());
  61     }
  62     {
  63         testbuf<char> sb;
  64         std::ostream os(&sb);
  65         signed char c = 'a';
  66         os << c;
  67         assert(sb.str() == "a");
  68     }
  69     {
  70         testbuf<char> sb;
  71         std::ostream os(&sb);
  72         os.width(5);
  73         signed char c = 'a';
  74         os << c;
  75         assert(sb.str() == "    a");
  76         assert(os.width() == 0);
  77     }
  78     {
  79         testbuf<char> sb;
  80         std::ostream os(&sb);
  81         os.width(5);
  82         left(os);
  83         signed char c = 'a';
  84         os << c;
  85         assert(sb.str() == "a    ");
  86         assert(os.width() == 0);
  87     }
  88 }