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bitset Class

Describes a type of object that stores a sequence consisting of a fixed number of bits that provide a compact way of keeping flags for a set of items or conditions. The bitset class supports operations on objects of type bitset that contain a collection of bits and provide constant-time access to each bit.

template <size_t N>
   class bitset


Specifies the number of bits in the bitset object with a nonzero integer of type size_t that must be known at compile time.


Unlike the similar vector<bool> Class, the bitset class does not have iterators and is not an Standard Template Library container. It also differs from vector<bool> by being of some specific size that is fixed at compile time in accordance with the size specified by the template parameter N when the bitset<N> is declared.

A bit is set if its value is 1 and reset if its value is 0. To flip or toggle a bit is to change its value from 1 to 0 or from 0 to 1. The N bits in a bitset are indexed by integer values from 0 to N - 1, where 0 indexes the first bit position and N - 1 the final bit position.


Header: <bitset>

See Also

bitset Members | <bitset> Members