std::boolalpha,std::noboolalpha (3) - Linux Manuals

std::boolalpha,std::noboolalpha: std::boolalpha,std::noboolalpha

NAME

std::boolalpha,std::noboolalpha - std::boolalpha,std::noboolalpha

Synopsis

Defined in header <ios>
std::ios_base& boolalpha( std::ios_base& str ); (1)
std::ios_base& noboolalpha( std::ios_base& str ); (2)

1) Enables the boolalpha flag in the stream str as if by calling str.setf(std::ios_base::boolalpha)
2) Disables the boolalpha flag in the stream str as if by calling str.unsetf(std::ios_base::boolalpha)
std::boolalpha is an I/O manipulator, so it may be called with an expression such as out << std::boolalpha for any out of type std::basic_ostream or with an expression such as in >> std::boolalpha for any in of type std::basic_istream.

Parameters

str - reference to I/O stream

Return value

str (reference to the stream after manipulation)

Example

// Run this code

  #include <sstream>
  #include <locale>
  #include <iostream>
  int main()
  {
      // boolalpha output
      std::cout << std::boolalpha
                << "boolalpha true: " << true << '\n'
                << "boolalpha false: " << false << '\n';
      std::cout << std::noboolalpha
                << "noboolalpha true: " << true << '\n'
                << "noboolalpha false: " << false << '\n';
      // boolalpha parse
      bool b1, b2;
      std::istringstream is("true false");
      is >> std::boolalpha >> b1 >> b2;
      std::cout << '\"' << is.str() << "\" parsed as " << b1 << ' ' << b2 << '\n';
  }

Output:

  boolalpha true: true
  boolalpha false: false
  noboolalpha true: 1
  noboolalpha false: 0
  "true false" parsed as 1 0