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swap (map)

Exchanges the elements of two maps.

template<class _Key, class _Ty, class _Pr, class _Alloc>
void swap(
   map<Key, Traits, Compare, Alloctor >& _Left,
   map<Key, Traits, Compare, Alloctor >& _Right
);

Parameters

  • _Right
    The map providing the elements to be swapped, or the map whose elements are to be exchanged with those of the map _Left.

  • _Left
    The map whose elements are to be exchanged with those of the map _Right.

Remarks

The template function is an algorithm specialized on the container class map to execute the member function _Left.swap(_Right). This is an instance of the partial ordering of function templates by the compiler. When template functions are overloaded in such a way that the match of the template with the function call is not unique, then the compiler will select the most specialized version of the template function. The general version of the template function, template <class T> void swap(T&, T&), in the algorithm class works by assignment and is a slow operation. The specialized version in each container is much faster as it can work with the internal representation of the container class.

Example

See the code example for member function map::swap for an example that uses the template version of swap.

Requirements

Header: <map>

Namespace: std

See Also

Reference

Standard Template Library

Other Resources

<map> Members