ReservationId.h

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#ifndef SQUID_SRC_HELPER_RESERVATIONID_H
#define SQUID_SRC_HELPER_RESERVATIONID_H
 
#include <ostream>
 
namespace Helper
{
class ReservationId
{
public:
    static ReservationId Next();
 
    bool reserved() const { return id > 0; }
 
    explicit operator bool() const { return reserved(); }
    bool operator !() const { return !reserved(); }
    bool operator ==(const Helper::ReservationId &other) const { return id == other.id; }
    bool operator !=(const Helper::ReservationId &other) const { return !(*this == other); }
 
    void clear() { id = 0; }
    uint64_t value() const {return id;}
 
    std::ostream &print(std::ostream &os) const;
 
private:
    uint64_t id = 0; 
};
 
inline std::ostream &
operator <<(std::ostream &os, const ReservationId &id)
{
    return id.print(os);
}
 
}; // namespace Helper
 
namespace std {
template <>
struct hash<Helper::ReservationId>
{
    typedef Helper::ReservationId argument_type;
    typedef std::size_t result_type;
    result_type operator()(const argument_type &reservation) const noexcept
    {
        std::hash<uint64_t> aHash;
        return aHash(reservation.value());
    }
};
}
 
#endif /* SQUID_SRC_HELPER_RESERVATIONID_H */