CGAL::Handle_hash_function Struct Reference

#include <CGAL/Handle_hash_function.h>

Definition

The class Handle_hash_function is a model for the UniqueHashFunction concept.

It is applicable for all key types with pointer-like functionality, such as handles, iterators, and circulators. Specifically, for a key value the expression &*key must return a unique address.

Is model of

UniqueHashFunction

See also

CGAL::Unique_hash_map<Key,Data,UniqueHashFunction>

Implementation

Plain type cast of &*key to std::size_t and divided by the size of the std::iterator_traits<Handle>::value_type to avoid correlations with the internal table size, which is a power of two.

Creation
	Handle_hash_function ()
	Default constructor.

Operations
template<class Handle >
std::size_t	operator() (const Handle &key)
	Returns unique hash value for any Handle type for which &*key gives a unique address.

Member Function Documentation

operator()()

template<class Handle >

std::size_t CGAL::Handle_hash_function::operator()

(

const Handle &

key

)

Returns unique hash value for any Handle type for which &*key gives a unique address.

The type std::iterator_traits<Handle>::value_type has to be defined (which it is already for pointers, handles, iterators, and circulators).