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Showing content from https://cplusplus.com/set::get_allocator below:

public member function

<set>

std::set::get_allocator 
allocator_type get_allocator() const;
allocator_type get_allocator() const noexcept;

Get allocator

Returns a copy of the allocator object associated with the set.

Parameters none

Return Value The allocator.

Member type allocator_type is the type of the allocator used by the container, defined in set as an alias of its third template parameter (Alloc).



Example 
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// set::get_allocator
#include <iostream>
#include <set>

int main ()
{
  std::set<int> myset;
  int * p;
  unsigned int i;

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

  // assign some values to array
  for (i=0; i<5; i++) p[i]=(i+1)*10;

  std::cout << "The allocated array contains:";
  for (i=0; i<5; i++) std::cout << ' ' << p[i];
  std::cout << '\n';

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

  return 0;
}
The example shows an elaborate way to allocate memory for an array of ints using the same allocator used by the container.
Output: 
The allocated array contains: 10 20 30 40 50


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
Concurrently accessing the elements of a set is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
Copying any instantiation of the default allocator is also guaranteed to never throw.

See also
allocator
Default allocator (class template)

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