mirror of
https://github.com/matrix-construct/construct
synced 2024-11-15 22:41:12 +01:00
103 lines
2.1 KiB
C++
103 lines
2.1 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_M_IMPORT_H
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namespace ircd::m
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{
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template<class prototype> struct import;
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struct imports extern imports;
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}
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struct ircd::m::imports
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:std::map<std::string, ircd::module, std::less<>>
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{
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void init();
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};
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template<class prototype>
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struct ircd::m::import
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:mods::import<prototype>
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{
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std::string modname;
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std::string symname;
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void reload();
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public:
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template<class... args> auto operator()(args&&... a);
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prototype *operator->();
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prototype &operator*();
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operator prototype &();
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import(std::string modname, std::string symname);
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};
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template<class prototype>
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ircd::m::import<prototype>::import(std::string modname,
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std::string symname)
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:mods::import<prototype>{}
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,modname{std::move(modname)}
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,symname{std::move(symname)}
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{}
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template<class prototype>
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ircd::m::import<prototype>::operator
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prototype &()
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{
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return this->operator*();
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}
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template<class prototype>
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prototype &
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ircd::m::import<prototype>::operator*()
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{
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return *this->operator->();
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}
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template<class prototype>
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prototype *
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ircd::m::import<prototype>::operator->()
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{
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if(unlikely(!*this))
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reload();
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return mods::import<prototype>::operator->();
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}
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template<class prototype>
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template<class... args>
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auto
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ircd::m::import<prototype>::operator()(args&&... a)
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{
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if(unlikely(!*this))
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reload();
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return mods::import<prototype>::operator()(std::forward<args>(a)...);
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}
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template<class prototype>
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void
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ircd::m::import<prototype>::reload()
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try
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{
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auto &import(static_cast<mods::import<prototype> &>(*this));
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import = { imports.at(modname), symname };
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}
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catch(const std::out_of_range &e)
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{
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throw m::UNAVAILABLE
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{
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"Sorry, %s in %s is currently unavailable.",
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symname,
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modname
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};
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}
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