std:: boolalpha, std:: noboolalpha
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Defined in header
<ios>
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||
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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.
setf
(
std::
ios_base
::
boolalpha
)
.
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
#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'; }
Output:
default true: 1 default false: 0 boolalpha true: true boolalpha false: false noboolalpha true: 1 noboolalpha false: 0 "true false" parsed as: true false
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<CharT>
)
|