C++ Map Library - multimap() Function


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Description

The C++ function std::multimap::multimap() constructs a multimap with copy of each elements present in existing container other.

Declaration

Following is the declaration for std::multimap::multimap() function form std::map header.

C++98

multimap (const multimap& other);

C++11

multimap (const multimap& other);
multimap (const multimap& other, const allocator_type& alloc);

Parameters

  • other − Another multimap object of same type.

  • alloc − The allocator object.

Return value

Constructor never returns value.

Exceptions

No effect on container if exception is thrown.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::multimap::multimap() function.

#include <iostream>
#include <map>

using namespace std;

int main(void) {
   /* Multimap with duplicates */
   multimap<char, int> m1 = {
         {'a', 1},
         {'a', 2},
         {'b', 3},
         {'c', 4},
         {'c', 5},
               };

   multimap<char, int>m2(m1);

   cout << "Multimap contains following elements:" << endl;

   for (auto it = m2.begin(); it != m2.end(); ++it)
      cout << it->first << " = " << it->second << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Multimap contains following elements:
a = 1
a = 2
b = 3
c = 4
c = 5
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