operator<<,>>(std::bitset)

 

C++

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Technical Specifications

 

Utilities library

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Function objects

initializer_list (C++11)

bitset

hash (C++11)

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

optional, any and variant (C++17)

optional

any

variant

in_placein_place_typein_place_indexin_place_tin_place_type_tin_place_index_t

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Type operations

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std::bitset

Member types

bitset::reference

Member functions

bitset::bitset

bitset::operator==bitset::operator!=

Element access

bitset::operator[]

bitset::test

bitset::allbitset::anybitset::none (C++11)

bitset::count

Capacity

bitset::size

Modifiers

bitset::operator&=bitset::operator|=bitset::operator^=bitset::operator~

bitset::operator<<=bitset::operator>>=bitset::operator<<bitset::operator>>

bitset::set

bitset::reset

bitset::flip

Conversions

bitset::to_string

bitset::to_ulong

bitset::to_ullong (C++11)

Non-member functions

operator&operator|operator^

operator<<operator>>

Helper classes

std::hash (C++11)

 

template <class CharT, class Traits, size_t N> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,                                               const bitset<N>& x);	(1)
template <class CharT, class Traits, size_t N> std::basic_istream<CharT, Traits>& operator>>(std::basic_istream<CharT, Traits>& is,                                               bitset<N>& x);	(2)

Inserts or extracts a bitset from a character stream.

1) Writes the bitset x to the character stream os as if by first converting it to a basic_string<CharT,Traits> using to_string(), and then writing it into os using the operator<< (which is a FormattedOutputFunction for strings). The characters to use for ones and zeroes are obtained from the currently-imbued locale by calling std::use_facet<std::ctype<CharT>(os.getloc()).widen() with '1' and '0' as arguments.

2) Behaves as a FormattedInputFunction. After constructing and checking the sentry object, which may skip leading whitespace, extracts up to N characters from is and stores the characters in the bitset x.

Characters are extracted until either

• N characters have been read,
• end-of-file occurs in is, or
• the next character is neither is.widen('0') nor is.widen('1').

If no characters are extracted, is.setstate(ios_base::failbit) is called.

Parameters

os	-	the character stream to write to
is	-	the character stream to read from
x	-	the bitset to be read or written

Return value

The character stream that was operated on, e.g. os or is.

Example

Run this code

#include <bitset>
#include <iostream>
#include <sstream>
 
int main()
{
    std::string bit_string = "001101";
    std::istringstream bit_stream(bit_string);
 
    std::bitset<3> b1;
    bit_stream >> b1; // reads "001", stream still holds "101"
    std::cout << b1 << '\n';
 
    std::bitset<8> b2;
    bit_stream >> b2; // reads "101", populates the 8-bit set as "00000101"
    std::cout << b2 << '\n';
}

Output:

001
00000101

See also

operator<<=operator>>=operator<<operator>>

performs binary shift left and shift right (public member function)