std::basic_streambuf<CharT,Traits>::sputc (3) - Linux Man Pages

std::basic_streambuf<CharT,Traits>::sputc: std::basic_streambuf<CharT,Traits>::sputc

Command to display std::basic_streambuf<CharT,Traits>::sputc manual in Linux: $ man 3 std::basic_streambuf<CharT,Traits>::sputc

std::basic_streambuf<CharT,Traits>::sputc - std::basic_streambuf<CharT,Traits>::sputc

int_type sputc( char_type ch );

Writes one character to the output sequence.
If the output sequence write position is not available (the buffer is full), then calls overflow(ch).

ch - character to write

The written character, converted to int_type with Traits::to_int_type(ch) on success.
Traits::eof() (as returned by overflow()) on failure.

// Run this code

#include <iostream>
#include <sstream>

  int main()
  {
      std::ostringstream s;
      s.rdbuf()->sputc('a');
      std::cout << s.str() << '\n';
  }