hash_map::key_comp
참고
이 API는 사용되지 않습니다.unordered_map 클래스를 대신 사용하는 것이 좋습니다.
Retrieves a copy of the comparison object used to order keys in a hash_map.
key_compare key_comp( ) const;
반환 값
Returns the function object that a hash_map uses to order its elements.
설명
The stored object defines the member function
bool operator(const Key& _Left**, const Key&** _Right);
that returns true if _Left precedes and is not equal to _Right in the sort order.
Visual C++.NET 2003에서, <hash_map> 및 <hash_set> 헤더 파일의 멤버는 더 이상 std 네임스페이스에 존재하지 않습니다. 대신 stdext 네임스페이스로 이동되었습니다. 자세한 내용은 stdext 네임스페이스를 참조하십시오.
예제
// hash_map_key_comp.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>
int main( )
{
using namespace std;
using namespace stdext;
hash_map <int, int, hash_compare<int, less<int> > > hm1;
hash_map <int, int, hash_compare<int, less<int> > >::key_compare
kc1 = hm1.key_comp( ) ;
// Operator stored in kc1 tests order & returns bool value
bool result1 = kc1( 2, 3 ) ;
if( result1 == true )
{
cout << "kc1( 2,3 ) returns value of true,"
<< "\n where kc1 is the function object of hm1"
<< " of type key_compare." << endl;
}
else
{
cout << "kc1( 2,3 ) returns value of false"
<< "\n where kc1 is the function object of hm1"
<< " of type key_compare." << endl;
}
hash_map <int, int, hash_compare<int, greater<int> > > hm2;
hash_map <int, int, hash_compare<int, greater<int> > >
::key_compare kc2 = hm2.key_comp( );
// Operator stored in kc2 tests order & returns bool value
bool result2 = kc2( 2, 3 ) ;
if( result2 == true )
{
cout << "kc2( 2,3 ) returns value of true,"
<< "\n where kc2 is the function object of hm2"
<< " of type key_compare." << endl;
}
else
{
cout << "kc2( 2,3 ) returns value of false,"
<< "\n where kc2 is the function object of hm2"
<< " of type key_compare." << endl;
}
}
Output
kc1( 2,3 ) returns value of true,
where kc1 is the function object of hm1 of type key_compare.
kc2( 2,3 ) returns value of false,
where kc2 is the function object of hm2 of type key_compare.
요구 사항
헤더: <hash_map>
네임스페이스: stdext