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: