AsyncFunCalls.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_BASE_ASYNCFUNCALLS_H
#define SQUID_BASE_ASYNCFUNCALLS_H
 
#include "base/AsyncCall.h"
 
#include <iostream>
 
class NullaryFunDialer: public CallDialer
{
public:
    using Handler = void ();
 
    explicit NullaryFunDialer(Handler * const aHandler): handler(aHandler) {}
 
    /* CallDialer API */
    bool canDial(AsyncCall &) { return bool(handler); }
    void dial(AsyncCall &) { handler(); }
    void print(std::ostream &os) const override { os << "()"; }
 
private:
    Handler *handler; 
};
 
template <typename Argument1>
class UnaryFunDialer: public CallDialer
{
public:
    using Handler = void (Argument1);
 
    UnaryFunDialer(Handler * const aHandler, Argument1 anArg1):
        handler(aHandler),
        arg1(anArg1)
    {}
    ~UnaryFunDialer() override = default;
 
    /* CallDialer API */
    bool canDial(AsyncCall &) { return bool(handler); }
    void dial(AsyncCall &) { handler(std::move(arg1)); }
    void print(std::ostream &os) const final { os << '(' << arg1 << ')'; }
 
private:
    Handler *handler; 
    Argument1 arg1; 
};
 
template <typename Argument1>
UnaryFunDialer<Argument1>
callDialer(void (*handler)(Argument1), Argument1 arg1)
{
    return UnaryFunDialer<Argument1>(handler, arg1);
}
 
#endif /* SQUID_BASE_ASYNCFUNCALLS_H */