mirror of
https://github.com/matrix-construct/construct
synced 2024-06-26 13:58:18 +02:00
97 lines
1.7 KiB
C++
97 lines
1.7 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_ITERATOR_H
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namespace ircd {
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inline namespace util {
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//
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// To collapse pairs of iterators down to a single type
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//
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template<class T>
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struct iterpair
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:std::pair<T, T>
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{
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using std::pair<T, T>::pair;
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};
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template<class T>
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T &
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begin(iterpair<T> &i)
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{
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return std::get<0>(i);
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}
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template<class T>
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T &
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end(iterpair<T> &i)
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{
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return std::get<1>(i);
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}
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template<class T>
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const T &
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begin(const iterpair<T> &i)
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{
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return std::get<0>(i);
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}
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template<class T>
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const T &
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end(const iterpair<T> &i)
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{
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return std::get<1>(i);
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}
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//
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// To collapse pairs of iterators down to a single type
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// typed by an object with iterator typedefs.
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//
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template<class T>
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using iterators = std::pair<typename T::iterator, typename T::iterator>;
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template<class T>
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using const_iterators = std::pair<typename T::const_iterator, typename T::const_iterator>;
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template<class T>
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typename T::iterator
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begin(const iterators<T> &i)
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{
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return i.first;
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}
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template<class T>
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typename T::iterator
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end(const iterators<T> &i)
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{
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return i.second;
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}
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template<class T>
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typename T::const_iterator
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begin(const const_iterators<T> &ci)
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{
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return ci.first;
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}
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template<class T>
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typename T::const_iterator
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end(const const_iterators<T> &ci)
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{
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return ci.second;
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}
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} // namespace util
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} // namespace ircd
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