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std::bitset<N>::reset

(1) 
bitset& reset();
 (until C++11) 
bitset& reset() noexcept;
 (since C++11)
(constexpr since C++23)		 
bitset& reset( std::size_t pos );
 (2) (constexpr since C++23)

Sets bits to false.

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

Parameters

pos - the position of the bit to set

Return value

*this

Exceptions

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

Example

#include <bitset>
#include <iostream>
 
int main()
{
    std::bitset<8> b(42);
    std::cout << "Bitset is         " << b << '\n';
    b.reset(1);
    std::cout << "After b.reset(1): " << b << '\n';
    b.reset();
    std::cout << "After b.reset():  " << b << '\n';
}

Output:

Bitset is         00101010
After b.reset(1): 00101000
After b.reset():  00000000

See also

sets bits to true or given value
(public member function)
toggles the values of bits
(public member function)

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https://en.cppreference.com/w/cpp/utility/bitset/reset