mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 00:30:49 +00:00
107 lines
1.8 KiB
C++
107 lines
1.8 KiB
C++
//
|
|
// Hash.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Hashing
|
|
// Module: Hash
|
|
//
|
|
// Definition of the Hash class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_Hash_INCLUDED
|
|
#define Foundation_Hash_INCLUDED
|
|
|
|
|
|
#include <cstddef>
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
std::size_t Foundation_API hash(Int8 n);
|
|
std::size_t Foundation_API hash(UInt8 n);
|
|
std::size_t Foundation_API hash(Int16 n);
|
|
std::size_t Foundation_API hash(UInt16 n);
|
|
std::size_t Foundation_API hash(Int32 n);
|
|
std::size_t Foundation_API hash(UInt32 n);
|
|
std::size_t Foundation_API hash(Int64 n);
|
|
std::size_t Foundation_API hash(UInt64 n);
|
|
std::size_t Foundation_API hash(const std::string & str);
|
|
|
|
|
|
template <class T>
|
|
struct Hash
|
|
/// A generic hash function.
|
|
{
|
|
std::size_t operator()(T value) const
|
|
/// Returns the hash for the given value.
|
|
{
|
|
return Poco::hash(value);
|
|
}
|
|
};
|
|
|
|
|
|
//
|
|
// inlines
|
|
//
|
|
inline std::size_t hash(Int8 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(UInt8 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(Int16 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(UInt16 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(Int32 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(UInt32 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(Int64 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
inline std::size_t hash(UInt64 n)
|
|
{
|
|
return static_cast<std::size_t>(n) * 2654435761U;
|
|
}
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_Hash_INCLUDED
|