std::basic_ostream<CharT,Traits>::put (3) - Linux Manuals

std::basic_ostream<CharT,Traits>::put: std::basic_ostream<CharT,Traits>::put

NAME

std::basic_ostream<CharT,Traits>::put - std::basic_ostream<CharT,Traits>::put

Synopsis

basic_ostream& put( char_type ch );

Behaves as an UnformattedOutputFunction. After constructing and checking the sentry object, writes the character ch to the output stream.
If the output fails for any reason, sets badbit.

Parameters

ch - character to write

Return value

*this

Notes

This function is not overloaded for the types signed char or unsigned char, unlike the formatted operator<<
Unlike formatted output functions, this function does not set the failbit if the output fails.

Example

// Run this code

  #include <fstream>
  #include <iostream>

  int main()
  {
      std::cout.put('a'); // normal usage
      std::cout.put('\n');

      std::ofstream s("/does/not/exist/");
      s.clear(); // pretend the stream is good
      std::cout << "Unformatted output: ";
      s.put('c'); // this will set badbit, but not failbit
      std::cout << " fail=" << bool(s.rdstate() & s.failbit);
      std::cout << " bad=" << s.bad() << '\n';
      s.clear();
      std::cout << "Formatted output: ";
      s << 'c'; // this will set badbit and failbit
      std::cout << " fail=" << bool(s.rdstate() & s.failbit);
      std::cout << " bad=" << s.bad() << '\n';
  }

Output:

  a
  Unformatted output: fail=0 bad=1
  Formatted output: fail=1 bad=1