std::boolalpha, std::noboolalpha
From cppreference.com
| Defined in header <ios>
|
||
| std::ios_base& boolalpha( std::ios_base& str ); |
(1) | |
| std::ios_base& noboolalpha( std::ios_base& str ); |
(2) | |
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'; // booalpha 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
See also
| clears the specified ios_base flags (function) | |
| sets the specified ios_base flags (function) | |
| [virtual] |
provides the string to use as the name of the boolean true and false (virtual protected member function of std::numpunct) |