/**
 * @file hash.h
 * @brief Hash Functionals.
 * @author Yu Peng (ypeng@cs.hku.hk)
 * @version 1.0.0
 * @date 2011-08-24
 */

#ifndef __BASIC_HASH_H_

#define __BASIC_HASH_H_

#include <stdint.h>

#include <functional>

template <typename T>
struct Hash: public std::unary_function<T, uint64_t> {
    uint64_t operator ()(const T &value) const {
        return value.hash();
    }
};

template <>
struct Hash<int8_t>: public std::unary_function<int8_t, uint64_t> {
    uint64_t operator ()(int8_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<uint8_t>: public std::unary_function<uint8_t, uint64_t> {
    uint64_t operator ()(uint8_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<int16_t>: public std::unary_function<int16_t, uint64_t> {
    uint64_t operator ()(int16_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<uint16_t>: public std::unary_function<uint16_t, uint64_t> {
    uint64_t operator ()(uint16_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<int32_t>: public std::unary_function<int32_t, uint64_t> {
    uint64_t operator ()(int32_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<uint32_t>: public std::unary_function<uint32_t, uint64_t> {
    uint64_t operator ()(uint32_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<int64_t>: public std::unary_function<int64_t, uint64_t> {
    uint64_t operator ()(int64_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

template <>
struct Hash<uint64_t>: public std::unary_function<uint64_t, uint64_t> {
    uint64_t operator ()(uint64_t value) const {
        return (uint64_t(value) * 1299709 + 104729) % 323780508946331ULL;
    }
};

#endif

