map<Key,T,Compare,Allocator>&
     operator= ( const map<Key,T,Compare,Allocator>& x );

Copy container content

Assigns a copy of the elements in x as the new content for the container.

The elements contained in the object before the call are dropped, and replaced by copies of those in map x, if any.

After a call to this member function, both the map object and x will have the same size and compare equal to each other.

Parameters

x

A map object with the same class template parameters (Key, T, Compare and Allocator).

Return value

Example

// assignment operator with maps
#include <iostream>
#include <map>
using namespace std;

int main ()
{
  map<char,int> first;
  map<char,int> second;

  first['x']=8;
  first['y']=16;
  first['z']=32;

  second=first;           // second now contains 3 ints
  first=map<char,int>();  // and first is now empty

  cout << "Size of first: " << int (first.size()) << endl;
  cout << "Size of second: " << int (second.size()) << endl;
  return 0;
}

Size of first: 0
Size of second: 3

Complexity

See also