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void swap ( map<Key,T,Compare,Allocator>& mp );
Swap content
Exchanges the content of the container with the content of mp, which is another map object containing elements of the same type. Sizes may differ.
After the call to this member function, the elements in this container are those which were in mp before the call, and the elements of mp are those which were in this. All iterators, references and pointers remain valid for the swapped objects.
Notice that a global algorithm function exists with this same name, swap, and the same behavior.
Parameters
- mp
- Another map container of the same type as this whose content is swapped with that of this container.
Return value
none
Example
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// swap maps
#include <iostream>
#include <map>
using namespace std;
int main ()
{
map<char,int> foo;
map<char,int> bar;
map<char,int>::iterator it;
foo['x']=100;
foo['y']=200;
bar['a']=11;
bar['b']=22;
bar['c']=33;
foo.swap(bar);
cout << "foo contains:\n";
for ( it=foo.begin() ; it != foo.end(); it++ )
cout << (*it).first << " => " << (*it).second << endl;
cout << "bar contains:\n";
for ( it=bar.begin() ; it != bar.end(); it++ )
cout << (*it).first << " => " << (*it).second << endl;
return 0;
}
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Output:
foo contains:
a => 11
b => 22
c => 33
bar contains:
x => 100
y => 200
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Complexity
Constant.
See also
| swap | Exchange values of two objects (function template) |
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