Returns an iterator to the first element in a multimap that with a key that is greater than a specified key.
iterator upper_bound(
const Key& _Key
);
const_iterator upper_bound(
const Key& _Key
) const;
Parameters
- _Key
The argument key to be compared with the sort key of an element from the multimap being searched.
Return Value
An iterator or const_iterator that addresses the ___location of an element in a multimap that with a key that is greater than the argument key, or that addresses the ___location succeeding the last element in the multimap if no match is found for the key.
If the return value is assigned to a const_iterator, the multimap object cannot be modified. If the return value is assigned to a iterator, the multimap object can be modified.
Example
// multimap_upper_bound.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
multimap <int, int> m1;
multimap <int, int> :: const_iterator m1_AcIter, m1_RcIter;
typedef pair <int, int> Int_Pair;
m1.insert ( Int_Pair ( 1, 10 ) );
m1.insert ( Int_Pair ( 2, 20 ) );
m1.insert ( Int_Pair ( 3, 30 ) );
m1.insert ( Int_Pair ( 3, 40 ) );
m1_RcIter = m1.upper_bound( 1 );
cout << "The 1st element of multimap m1 with "
<< "a key greater than 1 is: "
<< m1_RcIter -> second << "." << endl;
m1_RcIter = m1.upper_bound( 2 );
cout << "The first element of multimap m1 with a key "
<< " greater than 2 is: "
<< m1_RcIter -> second << "." << endl;
// If no match is found for the key, end( ) is returned
m1_RcIter = m1.lower_bound( 4 );
if ( m1_RcIter == m1.end( ) )
cout << "The multimap m1 doesn't have an element "
<< "with a key of 4." << endl;
else
cout << "The element of multimap m1 with a key of 4 is: "
<< m1_RcIter -> second << "." << endl;
// The element at a specific ___location in the multimap can be
// found using a derefenced iterator addressing the ___location
m1_AcIter = m1.begin( );
m1_RcIter = m1.upper_bound( m1_AcIter -> first );
cout << "The first element of m1 with a key greater than\n"
<< "that of the initial element of m1 is: "
<< m1_RcIter -> second << "." << endl;
}
The 1st element of multimap m1 with a key greater than 1 is: 20. The first element of multimap m1 with a key greater than 2 is: 30. The multimap m1 doesn't have an element with a key of 4. The first element of m1 with a key greater than that of the initial element of m1 is: 20.
Requirements
Header: <map>
Namespace: std