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% | Reference manual page: UniqueHashFunction.tex
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% | 08.07.2001   Lutz Kettner
% | Package: Hash_map
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\RCSdef{\RCSUniqueHashFunctionRev}{$Id$}
\RCSdefDate{\RCSUniqueHashFunctionDate}{$Date$}
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\begin{ccRefConcept}{UniqueHashFunction}

\ccDefinition

\ccRefName\ is a concept for a hash function with unique hash values.
An instance \ccc{hash} for a model of the \ccRefName\ concept is a
function object. It maps objects of its domain type \ccc{Key} to 
the integral image type \ccc{std::size_t}. The image values have to 
be unique for all keys in the domain type \ccc{Key}.

\ccRefines

\stl\ concept HashFunction.

\ccTypes
\ccThree{UniqueHashFunction&}{hash = UniqueHashFunction hash2}{}
\ccThreeToTwo

\ccTypedef{typedef std::size_t result_type;}{type of the hash value.}

\ccCreation
\ccCreationVariable{hash}

\ccConstructor{UniqueHashFunction( const UniqueHashFunction& hash2);}{
    copy constructor.}

\ccMethod{UniqueHashFunction& operator=( 
    const UniqueHashFunction& hash2);}{assignment.}

\ccOperations

\ccMethod{std::size_t operator()( const Key& key);}{
    returns unique hash value for the \ccc{key} value.}

\ccHasModels

\ccRefIdfierPage{CGAL::Handle_hash_function}

\ccSeeAlso

\ccRefIdfierPage{CGAL::Unique_hash_map<Key,Data,UniqueHashFunction>}

\end{ccRefConcept}

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