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107 lines
1.8 KiB
C++
107 lines
1.8 KiB
C++
//
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// Hash.h
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//
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// Library: Foundation
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// Package: Hashing
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// Module: Hash
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//
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// Definition of the Hash class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_Hash_INCLUDED
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#define Foundation_Hash_INCLUDED
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#include <cstddef>
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#include "Poco/Foundation.h"
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namespace Poco
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{
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std::size_t Foundation_API hash(Int8 n);
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std::size_t Foundation_API hash(UInt8 n);
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std::size_t Foundation_API hash(Int16 n);
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std::size_t Foundation_API hash(UInt16 n);
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std::size_t Foundation_API hash(Int32 n);
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std::size_t Foundation_API hash(UInt32 n);
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std::size_t Foundation_API hash(Int64 n);
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std::size_t Foundation_API hash(UInt64 n);
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std::size_t Foundation_API hash(const std::string & str);
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template <class T>
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struct Hash
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/// A generic hash function.
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{
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std::size_t operator()(T value) const
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/// Returns the hash for the given value.
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{
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return Poco::hash(value);
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}
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};
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//
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// inlines
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//
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inline std::size_t hash(Int8 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(UInt8 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(Int16 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(UInt16 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(Int32 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(UInt32 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(Int64 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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inline std::size_t hash(UInt64 n)
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{
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return static_cast<std::size_t>(n) * 2654435761U;
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}
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} // namespace Poco
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#endif // Foundation_Hash_INCLUDED
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