std::boolalpha, std::noboolalpha

Header: <ios>

  1. Enables the boolalpha flag in the stream str as if by calling str.setf(std::ios_base::boolalpha).

# Declarations

std::ios_base& boolalpha( std::ios_base& str );

std::ios_base& noboolalpha( std::ios_base& str );

# Parameters

# Return value

str (reference to the stream after manipulation).

# Example

#include <iostream>
#include <sstream>
 
int main()
{
    // boolalpha output
    std::cout << "default true: " << true << '\n'
              << "default false: " << false << '\n'
              << std::boolalpha 
              << "boolalpha true: " << true << '\n'
              << "boolalpha false: " << false << '\n'
              << 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: "
              << std::boolalpha << b1 << ' ' << b2 << '\n';
}

# See also