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Showing content from https://cplusplus.com/reference/map/map/max_size/ below:

public member function

<map>

std::map::max_size 
size_type max_size() const;
size_type max_size() const noexcept;

Return maximum size

Returns the maximum number of elements that the map container can hold.

This is the maximum potential size the container can reach due to known system or library implementation limitations, but the container is by no means guaranteed to be able to reach that size: it can still fail to allocate storage at any point before that size is reached.



Parameters none

Return Value The maximum number of elements a map container can hold as content.

Member type size_type is an unsigned integral type.



Example 
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// map::max_size
#include <iostream>
#include <map>

int main ()
{
  int i;
  std::map<int,int> mymap;

  if (mymap.max_size()>1000)
  {
    for (i=0; i<1000; i++) mymap[i]=0;
    std::cout << "The map contains 1000 elements.\n";
  }
  else std::cout << "The map could not hold 1000 elements.\n";

  return 0;
}

Here, member max_size is used to check beforehand whether the map will allow for 1000 elements to be inserted.

Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
No elements are accessed: concurrently accessing or modifying them is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
map::size
Return container size (public member function)

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