mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 15:00:51 +01:00
132 lines
2.5 KiB
C++
132 lines
2.5 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_MODS_SYM_PTR_H
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namespace ircd::mods
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{
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struct sym_ptr;
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}
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/// Representation of a symbol in a loaded library (non-template; low level).
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///
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class ircd::mods::sym_ptr
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:std::weak_ptr<mod>
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{
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void *ptr {nullptr};
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public:
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bool operator!() const;
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explicit operator bool() const;
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template<class T> const T *get() const;
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template<class T> const T *operator->() const;
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template<class T> const T &operator*() const;
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template<class T, class... args> auto operator()(args&&... a) const;
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template<class T> T *get();
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template<class T> T *operator->();
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template<class T> T &operator*();
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template<class T, class... args> auto operator()(args&&... a);
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explicit sym_ptr(mod &, const string_view &symname);
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sym_ptr(module, const string_view &symname);
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sym_ptr(const string_view &modname, const string_view &symname);
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sym_ptr() = default;
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};
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template<class T,
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class... args>
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auto
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ircd::mods::sym_ptr::operator()(args&&... a)
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{
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return (*get<T>())(std::forward<args>(a)...);
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}
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template<class T>
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T &
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ircd::mods::sym_ptr::operator*()
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{
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if(unlikely(expired()))
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throw expired_symbol
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{
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"The reference to a symbol in another module is no longer valid"
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};
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return *get<T>();
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}
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template<class T>
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T *
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ircd::mods::sym_ptr::operator->()
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{
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return get<T>();
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}
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template<class T>
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T *
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ircd::mods::sym_ptr::get()
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{
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return reinterpret_cast<T *>(ptr);
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}
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template<class T,
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class... args>
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auto
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ircd::mods::sym_ptr::operator()(args&&... a)
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const
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{
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return (*get<T>())(std::forward<args>(a)...);
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}
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template<class T>
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const T &
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ircd::mods::sym_ptr::operator*()
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const
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{
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if(unlikely(expired()))
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throw expired_symbol
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{
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"The const reference to a symbol in another module is no longer valid"
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};
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return *get<T>();
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}
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template<class T>
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const T *
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ircd::mods::sym_ptr::operator->()
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const
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{
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return get<T>();
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}
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template<class T>
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const T *
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ircd::mods::sym_ptr::get()
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const
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{
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return reinterpret_cast<const T *>(ptr);
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}
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inline ircd::mods::sym_ptr::operator
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bool()
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const
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{
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return !operator!();
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}
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inline bool
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ircd::mods::sym_ptr::operator!()
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const
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{
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return !ptr || expired();
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}
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