QuestionerId.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_IPC_QUESTIONERID_H
#define SQUID_SRC_IPC_QUESTIONERID_H
 
#include "ipc/forward.h"
 
#include <iosfwd>
 
namespace Ipc
{
 
class QuestionerId
{
public:
    QuestionerId() = default;
 
    void pack(TypedMsgHdr &) const;
 
    void unpack(const TypedMsgHdr &);
 
    void rejectAnswerIfStale() const;
 
    void print(std::ostream &) const;
 
private:
    explicit QuestionerId(const pid_t aPid): pid(aPid) {}
    friend QuestionerId MyQuestionerId();
 
    pid_t pid = -1;
};
 
QuestionerId MyQuestionerId();
 
template <class Answer>
const Answer &
Mine(const Answer &answer)
{
    answer.intendedRecepient().rejectAnswerIfStale();
    return answer;
}
 
inline std::ostream &
operator <<(std::ostream &os, const QuestionerId &qid)
{
    qid.print(os);
    return os;
}
 
} // namespace Ipc;
 
#endif /* SQUID_SRC_IPC_QUESTIONERID_H */