Defined in header <ios> | ||
---|---|---|
std::ios_base& boolalpha( std::ios_base& str ); | (1) | |
std::ios_base& noboolalpha( std::ios_base& str ); | (2) |
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
.
str | - | reference to I/O stream |
str
(reference to the stream after manipulation).
#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
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<CharT> ) |
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