| I/O manipulators | ||||
| Print functions(C++23) | ||||
| C-style I/O | ||||
| Buffers | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++20) | ||||
| Streams | ||||
| Abstractions | ||||
| File I/O | ||||
| String I/O | ||||
| Array I/O | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
| Synchronized Output | ||||
(C++20) | ||||
| Types | ||||
| Error category interface | ||||
(C++11) | ||||
(C++11) |
| Floating-point formatting | |||||||||||||||||||||||||||||||
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| Integer formatting | |||||||||||||||||||||||||||||||
| Boolean formatting | |||||||||||||||||||||||||||||||
boolalphanoboolalpha | |||||||||||||||||||||||||||||||
| Field width and fill control | |||||||||||||||||||||||||||||||
| Other formatting | |||||||||||||||||||||||||||||||
| Whitespace processing | |||||||||||||||||||||||||||||||
| Output flushing | |||||||||||||||||||||||||||||||
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| Status flags manipulation | |||||||||||||||||||||||||||||||
| Time and money I/O | |||||||||||||||||||||||||||||||
| Quoted manipulator | |||||||||||||||||||||||||||||||
(C++14) | |||||||||||||||||||||||||||||||
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 streamstr as if by callingstr.unsetf(std::ios_base::boolalpha).std::boolalpha is an I/O manipulator, so it may be called with an expression such asout<< std::boolalpha for anyout of typestd::basic_ostream or with an expression such asin>> std::boolalpha for anyin of typestd::basic_istream.
Contents |
| str | - | reference to I/O stream |
str (reference to the stream after manipulation).
#include <iostream>#include <sstream> int main(){// boolalpha outputstd::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 parsebool 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: 1default false: 0boolalpha true: trueboolalpha false: falsenoboolalpha true: 1noboolalpha false: 0"true false" parsed as: true false
| clears the specified ios_base flags (function)[edit] | |
sets the specifiedios_base flags(function)[edit] | |
[virtual] | provides the string to use as the name of the booleantrue andfalse (virtual protected member function of std::numpunct<CharT>)[edit] |
