mirror of
https://github.com/matrix-construct/construct
synced 2024-11-09 19:41:22 +01:00
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_UTIL_INSTANCE_LIST_H
|
|
|
|
namespace ircd::util
|
|
{
|
|
template<class T> struct instance_list;
|
|
}
|
|
|
|
/// The instance_list pattern is where every instance of a class registers
|
|
/// itself in a static list of all instances and removes itself on dtor.
|
|
/// IRCd Ex. All clients use instance_list so all clients can be listed for
|
|
/// an administrator or be interrupted and disconnected on server shutdown.
|
|
///
|
|
/// `struct myobj : ircd::instance_list<myobj> {};`
|
|
///
|
|
/// * The creator of the class no longer has to manually specify what is
|
|
/// defined here using unique_iterator; however, one still must provide
|
|
/// linkage for the static list.
|
|
///
|
|
/// * The container pointer used by unique_iterator is eliminated here
|
|
/// because of the static list.
|
|
///
|
|
template<class T>
|
|
struct ircd::util::instance_list
|
|
{
|
|
static std::list<T *> list;
|
|
|
|
protected:
|
|
typename decltype(list)::iterator it;
|
|
|
|
instance_list();
|
|
instance_list(instance_list &&);
|
|
instance_list(const instance_list &);
|
|
instance_list &operator=(instance_list &&);
|
|
instance_list &operator=(const instance_list &);
|
|
~instance_list() noexcept;
|
|
};
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T>::instance_list()
|
|
:it{list.emplace(end(list), static_cast<T *>(this))}
|
|
{}
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T>::instance_list(instance_list &&other)
|
|
:it{list.emplace(end(list), static_cast<T *>(this))}
|
|
{}
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T>::instance_list(const instance_list &other)
|
|
:it{list.emplace(end(list), static_cast<T *>(this))}
|
|
{}
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T> &
|
|
ircd::util::instance_list<T>::operator=(instance_list &&other)
|
|
{
|
|
assert(it != end(list));
|
|
return *this;
|
|
}
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T> &
|
|
ircd::util::instance_list<T>::operator=(const instance_list &other)
|
|
{
|
|
assert(it != end(list));
|
|
return *this;
|
|
}
|
|
|
|
template<class T>
|
|
ircd::util::instance_list<T>::~instance_list()
|
|
noexcept
|
|
{
|
|
assert(it != end(list));
|
|
list.erase(it);
|
|
}
|