mirror of
https://github.com/matrix-construct/construct
synced 2024-09-14 04:28:52 +02:00
84 lines
2 KiB
C++
84 lines
2 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_CONF_H
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namespace ircd::conf
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{
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template<class T = void> struct item; // doesn't exist
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template<class T> struct value; // abstraction for carrying item value
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template<> struct item<void>; // base class of all conf items
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template<> struct item<seconds>;
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IRCD_EXCEPTION(ircd::error, error)
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extern const std::string &config; //TODO: X
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void init(const string_view &configfile);
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}
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/// Conf item base class. You don't create this directly; use one of the
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/// derived templates instead.
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template<>
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struct ircd::conf::item<void>
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:instance_list<ircd::conf::item<>>
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{
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json::strung feature_;
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json::object feature;
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string_view name;
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virtual bool refresh();
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item(const json::members &);
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virtual ~item() noexcept;
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};
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/// Conf item value abstraction. If possible, the conf item will also
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/// inherit from this template to deduplicate functionality between
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/// conf items which contain similar classes of values.
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template<class T>
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struct ircd::conf::value
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:conf::item<>
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{
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using value_type = T;
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T _value;
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std::function<bool (T &)> refresher;
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operator const T &() const
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{
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return _value;
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}
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bool refresh() override
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{
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return refresher? refresher(_value) : false;
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}
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template<class U>
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value(const json::members &memb, U&& t)
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:conf::item<>{memb}
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,_value{std::forward<U>(t)}
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{}
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value(const json::members &memb = {})
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:conf::item<>{memb}
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,_value{feature.get<T>("default", T{})}
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{}
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};
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template<>
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struct ircd::conf::item<ircd::seconds>
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:conf::value<seconds>
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{
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using value_type = seconds;
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using value::value;
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};
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