mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 10:58:54 +01:00
119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_INSTANCE_MULTIMAP_H
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namespace ircd::util
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{
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template<class K, class T> struct instance_multimap;
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}
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/// See instance_multimap for purpose and overview.
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template<class K,
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class T>
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struct ircd::util::instance_multimap
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{
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static std::multimap<K, T *> map;
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protected:
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typename decltype(map)::iterator it;
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instance_multimap(const typename decltype(map)::const_iterator &hint, K&& key);
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instance_multimap(K&& key);
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instance_multimap(instance_multimap &&) noexcept;
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instance_multimap(const instance_multimap &);
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instance_multimap &operator=(instance_multimap &&) noexcept;
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instance_multimap &operator=(const instance_multimap &);
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~instance_multimap() noexcept;
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};
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T>::instance_multimap(K&& key)
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:it
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{
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map.emplace(std::forward<K>(key), static_cast<T *>(this))
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}
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{}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T>::instance_multimap(const typename decltype(map)::const_iterator &hint,
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K&& key)
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:it
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{
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map.emplace_hint(hint, std::forward<K>(key), static_cast<T *>(this))
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}
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{}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T>::instance_multimap(instance_multimap &&other)
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noexcept
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:it
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{
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std::move(other.it)
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}
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{
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if(it != end(map))
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{
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it->second = static_cast<T *>(this);
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other.it = end(map);
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}
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}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T>::instance_multimap(const instance_multimap &other)
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:it
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{
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other.it != end(map)?
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map.emplace_hint(other.it, other.it->first, static_cast<T *>(this)):
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end(map)
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}
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{}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T> &
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ircd::util::instance_multimap<K, T>::operator=(instance_multimap &&other)
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noexcept
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{
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this->~instance_multimap();
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it = std::move(other.it);
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if(it != end(map))
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it->second = static_cast<T *>(this);
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other.it = end(map);
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return *this;
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}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T> &
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ircd::util::instance_multimap<K, T>::operator=(const instance_multimap &other)
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{
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this->~instance_multimap();
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it = other.it != end(map)?
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map.emplace_hint(other.it, other.it->first, static_cast<T *>(this)):
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end(map);
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return *this;
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}
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template<class K,
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class T>
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ircd::util::instance_multimap<K, T>::~instance_multimap()
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noexcept
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{
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if(it != end(map))
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map.erase(it);
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}
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