Материал из C\C++ эксперт
iterator that cannot be used to change element values in multiset
#include <iostream>
using std::cout;
using std::endl;
#include <set> // multiset class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator
int main()
{
int a[ 10 ] = { 7, 22, 9, 1, 18, 30, 100, 22, 85, 13 };
std::multiset< int, std::less< int > > intMultiset;
std::ostream_iterator< int > output( cout, " " );
intMultiset.insert( 15 );
intMultiset.insert( 15 );
// iterator that cannot be used to change element values
std::multiset< int, std::less< int > >::const_iterator result;
// find 15 in intMultiset; find returns iterator
result = intMultiset.find( 15 );
if ( result != intMultiset.end() ) // if iterator not at end
cout << "Found value 15\n"; // found search value 15
cout << endl;
return 0;
}Found value 15
