public member function
<set>

std::multiset::empty

bool empty() const;
bool empty() const noexcept;
Test whether container is empty
Returns whether the multiset 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 multiset container, see multiset::clear.

Parameters

none

Return Value

true if the container size is 0, false otherwise.

Example

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

int main ()
{
  std::multiset<int> mymultiset;

  mymultiset.insert(10);
  mymultiset.insert(20);
  mymultiset.insert(10);

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

  return 0;
}


Output:
mymultiset contains: 10 10 20

Complexity

Constant.

Iterator validity

No changes.

Data races

The container is accessed.
Concurrently accessing the elements of a multiset is safe.

Exception safety

No-throw guarantee: this member function never throws exceptions.

See also

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