hashing.h

// Description: Hash computation
// Documentation: hashing.txt

#ifndef PASTELSYS_HASHING_H
#define PASTELSYS_HASHING_H

#include "pastel/sys/range.h"
#include "pastel/sys/mytypes.h"

#include <functional>
#include <string>

namespace Pastel
{

    //! Computes a hash for 'that'.
    template <typename Type>
    hash_integer computeHash(
        const Type& that);

    //! Combines an existing 32-bit hash with the hash of 'that'.
    template <
        typename Integer,
        RequiresC<sizeof(Integer) == sizeof(uint32)> = 0>
    Integer combineHash(Integer left, Integer right);

    //! Combines an existing 64-bit hash with the hash of 'that'.
    template <
        typename Integer,
        RequiresC<sizeof(Integer) == sizeof(uint64)> = 0>
    Integer combineHash(Integer left, Integer right);

    //! Sequentially combines the hashes of the input values.
    template <typename ConstRange>
    hash_integer computeHashMany(
        const ConstRange& input);

}

#include "pastel/sys/hashing/hashing.hpp"

#endif