public member function
<set>

std::set::count

size_type count (const value_type& val) const;
Count elements with a specific value
Searches the container for elements equivalent to val and returns the number of matches.

Because all elements in a set container are unique, the function can only return 1 (if the element is found) or zero (otherwise).

Two elements of a set are considered equivalent if the container's comparison object returns false reflexively (i.e., no matter the order in which the elements are passed as arguments).

Parameters

val
Value to search for.
Member type value_type is the type of the elements in the container, defined in set as an alias of its first template parameter (T).

Return value

1 if the container contains an element equivalent to val, or zero otherwise.

Member type size_type is an unsigned integral type.

Example

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

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

  // set some initial values:
  for (int i=1; i<5; ++i) myset.insert(i*3);    // set: 3 6 9 12

  for (int i=0; i<10; ++i)
  {
    std::cout << i;
    if (myset.count(i)!=0)
      std::cout << " is an element of myset.\n";
    else
      std::cout << " is not an element of myset.\n";
  }

  return 0;
}


Output:
0 is not an element of myset.
1 is not an element of myset.
2 is not an element of myset.
3 is an element of myset.
4 is not an element of myset.
5 is not an element of myset.
6 is an element of myset.
7 is not an element of myset.
8 is not an element of myset.
9 is an element of myset.

Complexity

Logarithmic in size.

Iterator validity

No changes.

Data races

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

Exception safety

Strong guarantee: if an exception is thrown, there are no changes in the container.

See also

  • 997351548 2018-02-20
  • 903691547 2018-02-20
  • 9127171546 2018-02-20
  • 2234751545 2018-02-20
  • 1685381544 2018-02-20
  • 911091543 2018-02-20
  • 9281021542 2018-02-20
  • 632231541 2018-02-20
  • 9751491540 2018-02-20
  • 8333621539 2018-02-20
  • 995001538 2018-02-20
  • 6477441537 2018-02-20
  • 511981536 2018-02-19
  • 2072881535 2018-02-19
  • 6024461534 2018-02-19
  • 7594061533 2018-02-19
  • 9311341532 2018-02-19
  • 4928331531 2018-02-19
  • 38561530 2018-02-19
  • 7776611529 2018-02-19