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advance

Categories: algorithms, iterators Component type: function

Prototype

template <class InputIterator, class Distance>
void advance(InputIterator& i, Distance n);

Description

Advance(i, n) increments the iterator i by the distance n. If n > 0 it is equivalent to executing ++i n times, and if n < 0 it is equivalent to executing --i n times. If n == 0, the call has no effect.

Definition

Defined in the standard header iterator, and in the nonstandard backward-compatibility header iterator.h.

Requirements on types

Preconditions

Complexity

Constant time if InputIterator is a model of random access iterator, otherwise linear time.

Example

list<int> L;
L.push_back(0);
L.push_back(1);

list<int>::iterator i = L.begin();
advance(i, 2);
assert(i == L.end());

Notes

See also

distance, Input iterator, Bidirectional Iterator, Random access iterator, iterator_traits, Iterator overview.


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