std::bitset<N>::set
From cppreference.com
bitset& set(); |
(1) | (noexcept since C++11) (constexpr since C++23) |
bitset& set( std::size_t pos, bool value = true ); |
(2) | (constexpr since C++23) |
Sets all bits to true or sets one bit to specified value.
1) Sets all bits to
true.2) Sets the bit at position
pos to the value value.Parameters
| pos | - | the position (counting from 0, i.e. from least significant to most significant) of the bit to set
|
| 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 bit position.Example
Run this code
#include <bitset>
#include <cstddef>
#include <iostream>
int main()
{
std::bitset<8> b;
std::cout << b << '\n';
std::cout << b.set() << '\n';
std::cout << b.reset() << '\n';
for (std::size_t i = 1; i < b.size(); i += 2)
b.set(i);
std::cout << b << '\n';
}
Output:
00000000
11111111
00000000
10101010
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 186 | C++98 | the type of value was int
|
corrected to bool
|
| LWG 2250 | C++98 | the behavior was undefined if pos doesnot correspond to a valid bit position |
always throws an exception in this case |
See also
sets bits to false (public member function) | |
| toggles the values of bits (public member function) |