unordered_map::get_allocator() is a built in function in C++ STL which is used to get allocator of container unordered_map.
Syntax
Allocator_type get_allocator()
Parameters: This function does not accept any parameter.
Return value: Returns an allocator associated with unordered_map.
Below programs explains clearly the unordered_map::get_allocator() function.
Example-1:
// CPP program to illustrate // unordered_map get_allocator() #include <bits/stdc++.h> using namespace std;
int main()
{ //'ump' is object of 'unordered_ump'
unordered_map< int , int > ump;
//'allocator_type' is inherit in 'unordered_map'
//'u' is object of 'allocator_type'
unordered_map< int , int >::allocator_type u = ump.get_allocator();
// Comparing the Allocator with Pair<int, int>
cout << "Is allocator Pair<int, int> : "
<< boolalpha
<< (u == allocator<pair< int , int > >());
return 0;
} |
Output:
Is allocator Pair : true
Example-2:
// CPP program to illustrate // unordered_map get_allocator() #include <bits/stdc++.h> using namespace std;
int main( void )
{ unordered_map< 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