mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
59 lines
1.0 KiB
C++
59 lines
1.0 KiB
C++
//
|
|
// HashFunction.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Hashing
|
|
// Module: HashFunction
|
|
//
|
|
// Definition of the HashFunction class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_HashFunction_INCLUDED
|
|
#define Foundation_HashFunction_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
#include "Poco/Hash.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
//@ deprecated
|
|
template <class T>
|
|
struct HashFunction
|
|
/// A generic hash function.
|
|
{
|
|
UInt32 operator()(T key, UInt32 maxValue) const
|
|
/// Returns the hash value for the given key.
|
|
{
|
|
return static_cast<UInt32>(Poco::hash(key)) % maxValue;
|
|
}
|
|
};
|
|
|
|
|
|
//@ deprecated
|
|
template <>
|
|
struct HashFunction<std::string>
|
|
/// A generic hash function.
|
|
{
|
|
UInt32 operator()(const std::string & key, UInt32 maxValue) const
|
|
/// Returns the hash value for the given key.
|
|
{
|
|
return static_cast<UInt32>(Poco::hash(key)) % maxValue;
|
|
}
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_HashFunctions_INCLUDED
|