multimap::key_comp
Retrieves a copy of the comparison object used to order keys in a multimap.
key_compare key_comp( ) const;
Return Value
Returns the function object that a multimap uses to order its elements.
Remarks
The stored object defines the member function
bool operator(const Key& x, const Key& y);
which returns true if x strictly precedes y in the sort order.
Example
// multimap_key_comp.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
multimap <int, int, less<int> > m1;
multimap <int, int, less<int> >::key_compare kc1 = m1.key_comp( ) ;
bool result1 = kc1( 2, 3 ) ;
if( result1 == true )
{
cout << "kc1( 2,3 ) returns value of true, "
<< "where kc1 is the function object of m1."
<< endl;
}
else
{
cout << "kc1( 2,3 ) returns value of false "
<< "where kc1 is the function object of m1."
<< endl;
}
multimap <int, int, greater<int> > m2;
multimap <int, int, greater<int> >::key_compare kc2 = m2.key_comp( );
bool result2 = kc2( 2, 3 ) ;
if( result2 == true )
{
cout << "kc2( 2,3 ) returns value of true, "
<< "where kc2 is the function object of m2."
<< endl;
}
else
{
cout << "kc2( 2,3 ) returns value of false, "
<< "where kc2 is the function object of m2."
<< endl;
}
}
kc1( 2,3 ) returns value of true, where kc1 is the function object of m1.
kc2( 2,3 ) returns value of false, where kc2 is the function object of m2.
Requirements
Header: <map>
Namespace: std