mirror of
https://github.com/matrix-construct/construct
synced 2024-07-31 06:44:42 +02:00
97 lines
1.9 KiB
C++
97 lines
1.9 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_JSON_TUPLE_KEYS_H
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namespace ircd {
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namespace json {
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template<class... T>
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struct tuple<T...>::keys
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:std::array<string_view, tuple<T...>::size()>
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{
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struct selection;
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struct include;
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struct exclude;
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constexpr keys()
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{
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_key_transform<tuple<T...>>(this->begin(), this->end());
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}
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};
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template<class... T>
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struct tuple<T...>::keys::selection
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:std::bitset<tuple<T...>::size()>
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{
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template<class closure>
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constexpr bool until(closure &&function) const
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{
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for(size_t i(0); i < this->size(); ++i)
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if(this->test(i))
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if(!function(key<tuple<T...>, i>()))
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return false;
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return true;
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}
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template<class closure>
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constexpr void for_each(closure &&function) const
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{
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this->until([&function](auto&& key)
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{
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function(key);
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return true;
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});
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}
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template<class it_a,
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class it_b>
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constexpr auto transform(it_a it, const it_b end) const
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{
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this->until([&it, &end](auto&& key)
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{
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if(it == end)
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return false;
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*it = key;
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++it;
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return true;
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});
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}
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};
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template<class... T>
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struct tuple<T...>::keys::include
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:selection
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{
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constexpr include(const std::initializer_list<string_view> &list)
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{
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for(const auto &key : list)
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this->set(indexof<tuple<T...>>(key), true);
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}
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};
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template<class... T>
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struct tuple<T...>::keys::exclude
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:selection
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{
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constexpr exclude(const std::initializer_list<string_view> &list)
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{
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this->set();
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for(const auto &key : list)
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this->set(indexof<tuple<T...>>(key), false);
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}
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};
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} // namespace json
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} // namespace ircd
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