multimap::upper_bound
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