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

C++ Set Library - size Function

It returns the number of elements in the set container.

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

size_type size() const;

size_type 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::size.

#include <iostream>
#include <set>

int main () {
   std::set<int> myints;
   std::cout << "0. size: " << myints.size() << '\n';

   for (int i = 0; i < 5; ++i) myints.insert(i);
   std::cout << "1. size: " << myints.size() << '\n';

   myints.insert (200);
   std::cout << "2. size: " << myints.size() << '\n';

   myints.erase(10);
   std::cout << "3. size: " << myints.size() << '\n';

   return 0;
}

The above program will compile and execute properly.

0. size: 0
1. size: 5
2. size: 6
3. size: 6

set.htm

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