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

1) Writes the bitset x to the character stream os as if by first converting it to a std:: 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 N > 0 and no characters are extracted, is. setstate ( ios_base :: failbit ) is called.

1) os

2) is

#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';
}

001
00000101