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unordered_multiset get_allocator in C++ STL

Last Updated : 11 Oct, 2018

The unordered_multiset::get_allocator() function is a STL function in C++ which is used to include unorder_multiset header file in program. This function gets the stored allocator object and returns the allocator object which is used to construct the container. It is a public member function.

allocator_type get_allocator() const;

Here allocator_type is the type of the allocator which is used by the container.

It does not accepts any parameter.

It returns the allocator type. Below program illustrate get_allocator method in C++ STL:

// c++ program to understand 'unordered_multiset_get_allocator'
#include <iostream>
#include <unordered_set>
using namespace std;

// main() method
int main() 
{
    
    //'m' is object of 'unordered_set'
    unordered_multiset<int> m;

    //'allocator_type' is inherit in 'unordered_multiset'
    //'t' is object of 'allocator_type'
    //'get_allocator()' is member of 'unordered_set'
    unordered_multiset<int>::allocator_type t = m.get_allocator();
    
    // Comparing the Allocator with 'Pair<int, int>'
    cout << "allocator is : "
        << boolalpha << (t == allocator<std::pair<int, int> >());
    
    return (0);
}

allocator is : true

It takes constant time of complexity to perform operation.

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