std::set::empty

bool empty() const;

bool empty() const noexcept;

Test whether container is empty

Returns whether the set container is empty (i.e. whether its size is 0).

This function does not modify the container in any way. To clear the content of a set container, see set::clear.

Parameters

none

Return Value

true if the container size is 0, false otherwise.

Example

// set::empty
#include <iostream>
#include <set>

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

  myset.insert(20);
  myset.insert(30);
  myset.insert(10);

  std::cout << "myset contains:";
  while (!myset.empty())
  {
     std::cout << ' ' << *myset.begin();
     myset.erase(myset.begin());
  }
  std::cout << '\n';

  return 0;
}