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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_set_max_size.htm below:

C++ Set Library - max_size Function

It returns the maximum number of elements that the set container can hold.

Following are the ways in which std::set::max_size works in various C++ versions.

size_type max_size() const;

size_type max_size() const noexcept;

It returns the number of elements in the set container.

It never throws exceptions.

Time complexity is contstant.

The following example shows the usage of std::set::max_size.

#include <iostream>
#include <set>

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

   if (myset.max_size()>100) {
      for (i = 0; i < 100; i++) myset.insert(i);
      std::cout << "The set contains 100 elements.\n";
   }
   else std::cout << "The set could not hold 100 elements.\n";

   return 0;
}

The above program will compile and execute properly.

The set contains 100 elements.

set.htm

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