multimap get_allocator() function in C++ STL

The multimap::get_allocator() is a function in STL in C++ that returns the copy of allocator object associated with this multimap.

Syntax:

multimap.get_allocator()

Return value: This function returns the copy of the allocator object associated with this multimap.

Below example illustrate the get_allocator() method:

Example:

// C++ program demonstrate
// multimap::get_allocator()

#include <iostream>
#include <map>
using namespace std;

int main()
{
    int psize;
    multimap<char, int> mm;
    pair<const char, int>* p;

    // allocate an array of 5 elements
    // using mm's allocator:
    p = mm.get_allocator().allocate(5);

    // assign some values to array
    psize = sizeof(multimap<char, int>::value_type) * 5;

    cout << "The size of allocated array is "
         << psize << " bytes.\n";

    mm.get_allocator().deallocate(p, 5);

    return 0;
}

Output:

The size of allocated array is 40 bytes.

Example 2:

// C++ program to demonstrate
// multimap::get_allocator()

#include <iostream>
#include <map>
using namespace std;

int main()
{
    int psize;

    multimap<char, int> mm;
    pair<const char, int>* p;

    // allocate an array of 10 elements
    // using mm's allocator:

    p = mm.get_allocator().allocate(10);

    // assign some values to array
    psize = sizeof(multimap<char, int>::value_type) * 10;

    cout << "The size of allocated array is "
         << psize << " bytes.\n";

    mm.get_allocator().deallocate(p, 10);

    return 0;
}

Output:

The size of allocated array is 80 bytes.