C++ Unordered_multimap Library - max_size() Function

---

Description

The C++ function std::unordered_multimap::max_size() returns the maximum number of elements can be held by unordered_multimap.

This value depends on system or library implementation.

Declaration

Following is the declaration for std::unordered_multimap::max_size() function form std::unordered_map() header.

C++11

size_type max_size() const noexcept;

Parameters

None

Return value

Returns the maximum number of elements can be held by unordered_multimap.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::unordered_multimap::max_size() function.

#include <iostream>
#include <unordered_map>

using namespace std;

int main(void) {
   unordered_multimap<char, int> umm;

   cout << "max_size = " << umm.max_size() << endl;

      return 0;
}

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

max_size = 1152921504606846975