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Showing content from https://cplusplus.com/reference/unordered_set/unordered_set/empty/ below:

public member function

<unordered_set>

bool empty() const noexcept;

Test whether container is empty

This function does not modify the content of the array in any way. To clear the content of an array object, member function unordered_set::clear exists.

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// unordered_set::empty
#include <iostream>
#include <string>
#include <unordered_set>

int main ()
{
  std::unordered_set<std::string> first;
  std::unordered_set<std::string> second = {"alpha","beta","gamma"};
  std::cout << "first " << (first.empty() ? "is empty" : "is not empty" ) << std::endl;
  std::cout << "second " << (second.empty() ? "is empty" : "is not empty" ) << std::endl;
  return 0;
}

first is empty
second is not empty

unordered_set::clear

Clear content (public member function)

unordered_set::size

Return container size (public member function)

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