std::bitset<N>::flip

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

Flips bits, i.e. changestrue values tofalse andfalse values totrue. Equivalent to a logical NOT operation on part or all of the bitset.

1) Flips all bits (likeoperator~, but in-place).

2) Flips the bit at the positionpos.

[edit]Parameters

pos

the position of the bit to flip

[edit]Return value

*this

[edit]Exceptions

2) Throwsstd::out_of_range ifpos does not correspond to a valid bit position.

[edit]Example

Run this code

#include <bitset>#include <iostream> int main(){std::bitset<4> flops; std::cout<< flops<<'\n'<< flops.flip(0)<<'\n'<< flops.flip(2)<<'\n'<< flops.flip()<<'\n';}

Output:

0000000101011010

[edit]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 ifpos does not correspond to a valid bit position	always throws an exception in this case

[edit]See also

set	sets bits totrue or given value (public member function)[edit]
reset	sets bits tofalse (public member function)[edit]
operator&=operator\|=operator^=operator~	performs binary AND, OR, XOR and NOT (public member function)[edit]
flip	flips all the bits (public member function of`std::vector<bool,Allocator>`)[edit]