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std::bitset<N>::set

(1) 
bitset& set();
 (until C++11) 
bitset& set() noexcept;
 (since C++11)
(until C++23) 
constexpr bitset& set() noexcept;
 (since C++23)
(2) 
bitset& set( std::size_t pos, bool value = true );
 (until C++23) 
constexpr bitset& set( std::size_t pos, bool value = true );
 (since C++23)

Sets all bits to true or to specified value.

1) Sets all bits to true.
2) Sets the bit at position pos to the value value.

Parameters

pos - the position of the bit to set (least significant to most significant)
value - the value to set the bit to

Return value

*this.

Exceptions

2) Throws std::out_of_range if pos does not correspond to a valid position within the bitset.

Example

#include <iostream>
#include <bitset>
 
int main()
{
    std::bitset<8> b;
    std::cout << b << '\n';
    std::cout << b.set() << '\n';
    std::cout << b.reset() << '\n';    
 
    for (size_t i = 1; i < b.size(); i += 2) {
        b.set(i);
    }
    std::cout << b << '\n';
}

Output:

00000000
11111111
00000000
10101010

See also

sets bits to false
(public member function)
toggles the values of bits
(public member function)

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