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Standard Template Library Programmer's Guide
(document number: 007-3426-004 / published: 1999-05-21) table of contents | additional info | download
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iter_swap


Category: algorithms	Component type: function

Prototype

template <class ForwardIterator1, class ForwardIterator2>
inline void iter_swap(ForwardIterator1 a, ForwardIterator2 b);

Description

Equivalent to swap(*a, *b). [1]

Definition

Declared in algo.h. The implementation is in algobase.h.

Requirements on types

ForwardIterator1 and ForwardIterator2 are models of Forward Iterator.
ForwardIterator1 and ForwardIterator2 are mutable.
ForwardIterator1 and ForwardIterator2 have the same value type.

Preconditions

ForwardIterator1 and ForwardIterator2 are dereferenceable.

Complexity

See swap for a discussion.

Example

int x = 1;
int y = 2;
assert(x == 1 && y == 2);
iter_swap(&x, &y);
assert(x == 2 && y == 1);

Notes

[1] Strictly speaking, iter_swap is redundant. It exists only for technical reasons: in some circumstances, some compilers have difficulty performing the type deduction required to interpret swap(*a, *b).