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Showing content from http://en.cppreference.com/w/cpp/../cpp/io/ios_base/../../utility/bitset/operator_ltltgtgt2.html below:

operator<<,>>(std::bitset) - cppreference.com

(1) (2)

Inserts or extracts a bitset from a character stream.

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').

N > 0

and no characters are extracted,

is.setstate(ios_base::failbit)

is called.

[edit] Parameters os - the character stream to write to is - the character stream to read from x - the bitset to be read or written [edit] Return value

1) os

2) is

[edit] Example

#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:

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 303 C++98 single-byte characters were extracted from
is, but CharT can have multiple bytes extracts CharT and compares
it with widened '0' and '1' LWG 396 C++98 the content written by operator<< was locale-independent writes widened '0's and '1's LWG 3199 C++98 extracting a std::bitset<0> always sets failbit such extraction never sets failbit [edit] See also

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