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std::bitset<N>:: reset

From cppreference.net
C++
Utilities library
std::bitset
bitset & reset ( ) ;
(1) (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 .

Contents

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 bit position.

Example

Run this code 
#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

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 2250 C++98 the behavior was undefined if pos does
not correspond to a valid bit position 		always throws an
exception in this case

See also

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