unordered_multimap get_allocator in C++ STL
Last Updated :
20 Feb, 2023
unordered_multimap::get_allocator() is a built in function in C++ STL which is used to get allocator of container unordered_mulitmap. Syntax:
Allocator_type get_allocator()
Parameters: This function does not accept any parameter. Return value: Returns an allocator associated with unordered_multimap. Below programs illustrate the working of unordered_multimap::get_allocator() function. Example-1:
CPP
#include <bits/stdc++.h>
using namespace std;
int main()
{
unordered_multimap< int , int > ump;
unordered_multimap< int , int >::allocator_type u = ump.get_allocator();
cout << "Is allocator Pair< int , int > : "
<< boolalpha
<< (u == allocator<pair< int , int > >());
return 0;
}
|
Output:
Is allocator Pair : true
Example-2:
CPP
#include <bits/stdc++.h>
using namespace std;
int main( void )
{
unordered_multimap< char , int > um;
pair< const char , int >* a;
a = um.get_allocator().allocate(8);
cout << "Allocated size = " << sizeof (*a) * 8 << endl;
return 0;
}
|
Output:
Allocated size = 64
Time complexity: O(1).
Auxiliary space: O(1).
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