ClickHouse/base/poco/Foundation/include/Poco/HashFunction.h

//
// 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