public member function

std::multimap::find

<map>
      iterator find ( const key_type& x );
const_iterator find ( const key_type& x ) const;
Get iterator to element
Searches the container for an element with a value of x and returns an iterator to it if found, otherwise it returns an iterator to multimap::end (the element past the end of the container).

Notice that this function returns an iterator to only one of the elements with that value; To obtain the entire range of elements with a given value, you can use multimap::equal_range.

Parameters

x
Value to be searched for.
key_type is a member type defined in multimap containers as an alias of Key, which is the first template parameter and the type of the keys for the elements stored in the container.

Return value

An iterator to the element, if the specified key value is found, or multimap::end if the specified key is not found in the container.

Both iterator and const_iterator are member types. In the multimap class template, these are bidirectional iterators.
Dereferencing this iterator accesses the element's value, which is of type pair<const Key,T>.

Example

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// multimap::find
#include <iostream>
#include <map>
using namespace std;

int main ()
{
  multimap<char,int> mymm;
  multimap<char,int>::iterator it;

  mymm.insert (pair<char,int>('x',10));
  mymm.insert (pair<char,int>('y',20));
  mymm.insert (pair<char,int>('z',30));
  mymm.insert (pair<char,int>('z',40));

  it=mymm.find('x');
  mymm.erase (it);
  mymm.erase (mymm.find('z'));

  // print content:
  cout << "elements in mymm:" << endl;
  cout << "y => " << mymm.find('y')->second << endl;
  cout << "z => " << mymm.find('z')->second << endl;

  return 0;
}


Output:
elements in mymm:
y => 20
z => 40

Complexity

Logarithmic in size.

See also

multimap::equal_range
Get range of equal elements (public member function)
multimap::count
Count elements with a specific key (public member function)
multimap::lower_bound
Return iterator to lower bound (public member function)
multimap::upper_bound
Return iterator to upper bound (public member function)

C++