C++ Map Library - get_allocator() Function

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Description

The C++ function std::map::get_allocator() returns an allocator associated with map.

Declaration

Following is the declaration for std::map::get_allocator() function form std::map header.

C++98

allocator_type get_allocator() const;

C++11

allocator_type get_allocator() const noexcept;

Parameters

None

Return value

Returns an allocator associated with map.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::map::get_allocator() function.

#include <iostream>
#include <map>

using namespace std;

int main(void) {
   map<char, int> m;
   pair<const char, int> *p;

   p = m.get_allocator().allocate(5);

   cout << "Allocated size = " <<  sizeof(*p) * 5 << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Allocated size = 40