/usr/include/Gyoto/GyotoHooks.h is in libgyoto1-dev 0.1.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file GyotoHooks.h
* \brief Tellers tell Listeners when they mutate
*
* A Listener can hook() to a Teller. The Teller will tell it when
* it mutates using Listener::tell(), usually through the highter
* lever Teller::tellListeners(). The Listener can later
* unhook(). The Listener must therefore implement Listener::tell()
* to react when it is told.
*/
/*
Copyright 2012-2013 Thibaut Paumard
This file is part of Gyoto.
Gyoto is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Gyoto is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Gyoto. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __GyotoHooks_h
#define __GyotoHooks_h
/**
* \namespace Gyoto::Hook
* \brief Listeners attach to Tellers
*
* A Listener can hook() to a Teller. The Teller will tell it when
* it mutates using Listener::tell(), usually through the highter
* lever Teller::tellListeners(). The Listener can later
* unhook(). The Listener must therefore implement Listener::tell()
* to react when it is told.
*/
namespace Gyoto {
namespace Hook {
/**
* \class Teller
* \brief Listen to me and I'll warn you when I change
*
* Listen to me by calling my hook() method.
*/
class Teller;
/**
* \class Listener
* \brief I might listen to a Teller
*
* Whisper to my ear by using my tell() method.
*/
class Listener;
};
};
class Gyoto::Hook::Listener {
friend class Gyoto::Hook::Teller;
public:
Listener(); ///< Constructor
~Listener(); ///< Destructor
protected:
/**
* \brief This is how a Teller tells
*
* A teller will basically call listener->tell(this).
*
* \param msg Teller* the Teller who is telling... Useful if the
* Listener listens to several Tellers.
*/
virtual void tell(Gyoto::Hook::Teller *msg);
};
class Gyoto::Hook::Teller {
friend class Gyoto::Hook::Listener;
private:
/**
* \class ListenerItem
* \brief Private (undocumented) class to hold listeners_
*/
class ListenerItem;
/**
* \brief Linked list of Listener items
*/
ListenerItem *listeners_;
public:
Teller(); ///< Default constructor
Teller(const Teller &); ///< Copy constructor
~Teller(); ///< Destructor
/**
* \brief Start listening
*
* Use from a Hook::Listener object method:
* \code
* teller->hook(this)
* \endcode
* where "this" is a Listener and "teller" is a Teller.
*
* Use unhook() later to stop listening to a given Teller.
*
* \param listener pointer to the new listener
*/
virtual void hook (Listener * listener);
/**
* \brief Stop listening
*
* Use from a Hook::Listener object method:
* \code
* teller->unhook(this)
* \endcode
* where "this" is a Listener, "teller" is a Teller, and "this" has
* called teller->hook(this) previously.
*
* \param listener pointer to the listener
*/
virtual void unhook (Listener * listener);
protected:
/**
* \brief Call tell() on each hooked Listener
*
* Whenever a Teller mutates, it should warn any Listener hooked to
* it using tellListeners().
*/
virtual void tellListeners();
};
#endif
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