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construct/include/ircd/json/tuple/keys.h

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// 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_JSON_TUPLE_KEYS_H
namespace ircd {
namespace json {
template<class... T>
struct tuple<T...>::keys
:std::array<string_view, tuple<T...>::size()>
{
struct selection;
struct include;
struct exclude;
constexpr keys()
{
_key_transform<tuple<T...>>(this->begin(), this->end());
}
};
template<class... T>
struct tuple<T...>::keys::selection
:std::bitset<tuple<T...>::size()>
{
template<class closure>
constexpr bool until(closure &&function) const
{
for(size_t i(0); i < this->size(); ++i)
if(this->test(i))
if(!function(key<tuple<T...>, i>()))
return false;
return true;
}
template<class closure>
constexpr void for_each(closure &&function) const
{
this->until([&function](auto&& key)
{
function(key);
return true;
});
}
template<class it_a,
class it_b>
constexpr auto transform(it_a it, const it_b end) const
{
this->until([&it, &end](auto&& key)
{
if(it == end)
return false;
*it = key;
++it;
return true;
});
}
};
template<class... T>
struct tuple<T...>::keys::include
:selection
{
constexpr include(const std::initializer_list<string_view> &list)
{
for(const auto &key : list)
this->set(indexof<tuple<T...>>(key), true);
}
};
template<class... T>
struct tuple<T...>::keys::exclude
:selection
{
constexpr exclude(const std::initializer_list<string_view> &list)
{
this->set();
for(const auto &key : list)
this->set(indexof<tuple<T...>>(key), false);
}
};
} // namespace json
} // namespace ircd