mirror of
https://github.com/matrix-construct/construct
synced 2024-07-08 11:38:35 +02:00
157 lines
3 KiB
C++
157 lines
3 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_GET_H
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namespace ircd {
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namespace json {
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template<size_t hash,
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class tuple>
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inline enable_if_tuple<tuple, const tuple_value_type<tuple, indexof<tuple, hash>()> &>
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get(const tuple &t)
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noexcept
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{
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constexpr size_t idx
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{
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indexof<tuple, hash>()
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};
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const auto &ret
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{
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val<idx>(t)
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};
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return ret;
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}
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template<size_t hash,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, hash>()>>
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get(const tuple &t,
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const tuple_value_type<tuple, indexof<tuple, hash>()> &def)
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noexcept
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{
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constexpr size_t idx
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{
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indexof<tuple, hash>()
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};
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const auto &ret
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{
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val<idx>(t)
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};
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return defined(json::value(ret))? ret : def;
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}
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template<size_t hash,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, hash>()> &>
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get(tuple &t)
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noexcept
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{
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constexpr size_t idx
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{
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indexof<tuple, hash>()
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};
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auto &ret
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{
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val<idx>(t)
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};
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return ret;
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}
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template<size_t hash,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, hash>()> &>
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get(tuple &t,
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tuple_value_type<tuple, indexof<tuple, hash>()> &def)
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noexcept
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{
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auto &ret
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{
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get<hash, tuple>(t)
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};
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return defined(json::value(ret))? ret : def;
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}
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template<const char *const &name,
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class tuple>
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inline enable_if_tuple<tuple, const tuple_value_type<tuple, indexof<tuple, name>()> &>
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get(const tuple &t)
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noexcept
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{
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return get<name_hash(name), tuple>(t);
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}
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template<const char *const &name,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, name>()>>
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get(const tuple &t,
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const tuple_value_type<tuple, indexof<tuple, name>()> &def)
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noexcept
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{
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return get<name_hash(name), tuple>(t, def);
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}
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template<const char *const &name,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, name>()>>
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get(tuple &t)
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noexcept
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{
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return get<name_hash(name), tuple>(t);
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}
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template<const char *const &name,
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class tuple>
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inline enable_if_tuple<tuple, tuple_value_type<tuple, indexof<tuple, name>()>>
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get(tuple &t,
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tuple_value_type<tuple, indexof<tuple, hash>()> &def)
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noexcept
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{
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return get<name_hash(name), tuple>(t, def);
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}
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template<class R,
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class tuple>
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inline enable_if_tuple<tuple, R>
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get(const tuple &t,
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const string_view &name,
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R ret)
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noexcept
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{
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until(t, [&name, &ret]
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(const auto &key, auto&& val)
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noexcept
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{
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if constexpr(std::is_assignable<R, decltype(val)>())
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{
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if(key == name)
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{
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ret = val;
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return false;
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}
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else return true;
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}
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else return true;
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});
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return ret;
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}
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} // namespace json
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} // namespace ircd
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