559 lines
21 KiB
C++
559 lines
21 KiB
C++
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// Copyright 2015-2016 Klemens D. Morgenstern
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_DLL_IMPORT_CLASS_HPP_
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#define BOOST_DLL_IMPORT_CLASS_HPP_
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#include <boost/dll/smart_library.hpp>
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#include <boost/dll/import_mangled.hpp>
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#include <memory>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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namespace boost { namespace dll { namespace experimental {
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namespace detail
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{
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template<typename T>
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struct deleter
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{
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destructor<T> dtor;
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bool use_deleting;
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deleter(const destructor<T> & dtor, bool use_deleting = false) :
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dtor(dtor), use_deleting(use_deleting) {}
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void operator()(T*t)
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{
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if (use_deleting)
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dtor.call_deleting(t);
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else
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{
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dtor.call_standard(t);
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//the thing is actually an array, so delete[]
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auto p = reinterpret_cast<char*>(t);
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delete [] p;
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}
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}
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};
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template<class T, class = void>
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struct mem_fn_call_proxy;
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template<class Class, class U>
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struct mem_fn_call_proxy<Class, boost::dll::experimental::detail::mangled_library_mem_fn<Class, U>>
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{
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typedef boost::dll::experimental::detail::mangled_library_mem_fn<Class, U> mem_fn_t;
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Class* t;
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mem_fn_t & mem_fn;
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mem_fn_call_proxy(mem_fn_call_proxy&&) = default;
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mem_fn_call_proxy(const mem_fn_call_proxy & ) = delete;
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mem_fn_call_proxy(Class * t, mem_fn_t & mem_fn)
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: t(t), mem_fn(mem_fn) {}
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template<typename ...Args>
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auto operator()(Args&&...args) const
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{
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return mem_fn(t, std::forward<Args>(args)...);
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}
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};
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template<class T, class Return, class ...Args>
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struct mem_fn_call_proxy<T, Return(Args...)>
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{
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T* t;
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const std::string &name;
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smart_library &_lib;
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mem_fn_call_proxy(mem_fn_call_proxy&&) = default;
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mem_fn_call_proxy(const mem_fn_call_proxy&) = delete;
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mem_fn_call_proxy(T *t, const std::string &name, smart_library & _lib)
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: t(t), name(name), _lib(_lib) {};
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Return operator()(Args...args) const
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{
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auto f = _lib.get_mem_fn<T, Return(Args...)>(name);
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return (t->*f)(static_cast<Args>(args)...);
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}
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};
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}
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template<typename T>
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class imported_class;
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template<typename T, typename ... Args> imported_class<T>
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import_class(const smart_library& lib, Args...args);
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template<typename T, typename ... Args> imported_class<T>
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import_class(const smart_library& lib, const std::string & alias_name, Args...args);
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template<typename T, typename ... Args> imported_class<T>
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import_class(const smart_library& lib, std::size_t size, Args...args);
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template<typename T, typename ... Args> imported_class<T>
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import_class(const smart_library& lib, std::size_t size,
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const std::string & alias_name, Args...args);
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/*! This class represents an imported class.
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*
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* \note It must be constructed via \ref boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
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*
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* \tparam The type or type-alias of the imported class.
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*/
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template<typename T>
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class imported_class
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{
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smart_library _lib;
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std::unique_ptr<T, detail::deleter<T>> _data;
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bool _is_allocating;
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std::size_t _size;
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const std::type_info& _ti;
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template<typename ... Args>
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inline std::unique_ptr<T, detail::deleter<T>> make_data(const smart_library& lib, Args ... args);
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template<typename ... Args>
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inline std::unique_ptr<T, detail::deleter<T>> make_data(const smart_library& lib, std::size_t size, Args...args);
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template<typename ...Args>
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imported_class(detail::sequence<Args...> *, const smart_library& lib, Args...args);
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template<typename ...Args>
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imported_class(detail::sequence<Args...> *, const smart_library& lib, std::size_t size, Args...args);
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template<typename ...Args>
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imported_class(detail::sequence<Args...> *, smart_library&& lib, Args...args);
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template<typename ...Args>
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imported_class(detail::sequence<Args...> *, smart_library&& lib, std::size_t size, Args...args);
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public:
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//alias to construct with explicit parameter list
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template<typename ...Args>
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static imported_class<T> make(smart_library&& lib, Args...args)
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{
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typedef detail::sequence<Args...> *seq;
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return imported_class(seq(), boost::move(lib), static_cast<Args>(args)...);
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}
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template<typename ...Args>
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static imported_class<T> make(smart_library&& lib, std::size_t size, Args...args)
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{
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typedef detail::sequence<Args...> *seq;
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return imported_class(seq(), boost::move(lib), size, static_cast<Args>(args)...);
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}
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template<typename ...Args>
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static imported_class<T> make(const smart_library& lib, Args...args)
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{
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typedef detail::sequence<Args...> *seq;
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return imported_class(seq(), lib, static_cast<Args>(args)...);
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}
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template<typename ...Args>
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static imported_class<T> make(const smart_library& lib, std::size_t size, Args...args)
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{
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typedef detail::sequence<Args...> *seq;
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return imported_class(seq(), lib, size, static_cast<Args>(args)...);
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}
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typedef imported_class<T> base_t;
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///Returns a pointer to the underlying class
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T* get() {return _data.get();}
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imported_class() = delete;
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imported_class(imported_class&) = delete;
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imported_class(imported_class&&) = default; ///<Move constructor
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imported_class& operator=(imported_class&) = delete;
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imported_class& operator=(imported_class&&) = default; ///<Move assignmend
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///Check if the imported class is move-constructible
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bool is_move_constructible() {return !_lib.symbol_storage().template get_constructor<T(T&&)> ().empty();}
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///Check if the imported class is move-assignable
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bool is_move_assignable() {return !_lib.symbol_storage().template get_mem_fn<T, T&(T&&)> ("operator=").empty();}
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///Check if the imported class is copy-constructible
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bool is_copy_constructible() {return !_lib.symbol_storage().template get_constructor<T(const T&)>().empty();}
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///Check if the imported class is copy-assignable
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bool is_copy_assignable() {return !_lib.symbol_storage().template get_mem_fn<T, T&(const T&)>("operator=").empty();}
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imported_class<T> copy() const; ///<Invoke the copy constructor. \attention Undefined behaviour if the imported object is not copy constructible.
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imported_class<T> move(); ///<Invoke the move constructor. \attention Undefined behaviour if the imported object is not move constructible.
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///Invoke the copy assignment. \attention Undefined behaviour if the imported object is not copy assignable.
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void copy_assign(const imported_class<T> & lhs) const;
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///Invoke the move assignment. \attention Undefined behaviour if the imported object is not move assignable.
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void move_assign( imported_class<T> & lhs);
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///Check if the class is loaded.
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explicit operator bool() const {return _data;}
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///Get a const reference to the std::type_info.
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const std::type_info& get_type_info() {return _ti;};
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/*! Call a member function. This returns a proxy to the function.
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* The proxy mechanic mechanic is necessary, so the signaute can be passed.
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*
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* \b Example
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*
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* \code
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* im_class.call<void(const char*)>("function_name")("MyString");
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* \endcode
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*/
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template<class Signature>
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const detail::mem_fn_call_proxy<T, Signature> call(const std::string& name)
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{
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return detail::mem_fn_call_proxy<T, Signature>(_data.get(), name, _lib);
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}
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/*! Call a qualified member function, i.e. const and or volatile.
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*
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* \b Example
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*
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* \code
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* im_class.call<const type_alias, void(const char*)>("function_name")("MyString");
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* \endcode
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*/
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template<class Tin, class Signature, class = boost::enable_if<detail::unqalified_is_same<T, Tin>>>
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const detail::mem_fn_call_proxy<Tin, Signature> call(const std::string& name)
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{
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return detail::mem_fn_call_proxy<Tin, Signature>(_data.get(), name, _lib);
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}
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///Overload of ->* for an imported method.
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template<class Tin, class T2>
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const detail::mem_fn_call_proxy<Tin, boost::dll::experimental::detail::mangled_library_mem_fn<Tin, T2>>
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operator->*(detail::mangled_library_mem_fn<Tin, T2>& mn)
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{
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return detail::mem_fn_call_proxy<Tin, boost::dll::experimental::detail::mangled_library_mem_fn<Tin, T2>>(_data.get(), mn);
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}
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///Import a method of the class.
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template <class ...Args>
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typename boost::dll::experimental::detail::mangled_import_type<boost::dll::experimental::detail::sequence<T, Args...>>::type
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import(const std::string & name)
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{
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return boost::dll::experimental::import_mangled<T, Args...>(_lib, name);
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}
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};
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//helper function, uses the allocating
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template<typename T>
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template<typename ... Args>
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inline std::unique_ptr<T, detail::deleter<T>> imported_class<T>::make_data(const smart_library& lib, Args ... args)
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{
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constructor<T(Args...)> ctor = lib.get_constructor<T(Args...)>();
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destructor<T> dtor = lib.get_destructor <T>();
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if (!ctor.has_allocating() || !dtor.has_deleting())
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{
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boost::system::error_code ec;
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ec = boost::system::error_code(
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boost::system::errc::bad_file_descriptor,
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boost::system::generic_category()
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);
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// report_error() calls dlsym, do not use it here!
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boost::throw_exception(
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boost::system::system_error(
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ec, "boost::dll::detail::make_data() failed: no allocating ctor or dtor was found"
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)
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);
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}
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return std::unique_ptr<T, detail::deleter<T>> (
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ctor.call_allocating(static_cast<Args>(args)...),
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detail::deleter<T>(dtor, false /* not deleting dtor*/));
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}
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//helper function, using the standard
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template<typename T>
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template<typename ... Args>
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inline std::unique_ptr<T, detail::deleter<T>> imported_class<T>::make_data(const smart_library& lib, std::size_t size, Args...args)
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{
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constructor<T(Args...)> ctor = lib.get_constructor<T(Args...)>();
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destructor<T> dtor = lib.get_destructor <T>();
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if (!ctor.has_standard() || !dtor.has_standard())
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{
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boost::system::error_code ec;
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ec = boost::system::error_code(
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boost::system::errc::bad_file_descriptor,
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boost::system::generic_category()
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);
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// report_error() calls dlsym, do not use it here!
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boost::throw_exception(
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boost::system::system_error(
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ec, "boost::dll::detail::make_data() failed: no regular ctor or dtor was found"
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)
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);
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}
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T *data = reinterpret_cast<T*>(new char[size]);
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ctor.call_standard(data, static_cast<Args>(args)...);
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return std::unique_ptr<T, detail::deleter<T>> (
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reinterpret_cast<T*>(data),
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detail::deleter<T>(dtor, false /* not deleting dtor*/));
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}
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template<typename T>
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template<typename ...Args>
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imported_class<T>::imported_class(detail::sequence<Args...> *, const smart_library & lib, Args...args)
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: _lib(lib),
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_data(make_data<Args...>(lib, static_cast<Args>(args)...)),
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_is_allocating(false),
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_size(0),
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_ti(lib.get_type_info<T>())
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{
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}
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template<typename T>
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template<typename ...Args>
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imported_class<T>::imported_class(detail::sequence<Args...> *, const smart_library & lib, std::size_t size, Args...args)
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: _lib(lib),
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_data(make_data<Args...>(lib, size, static_cast<Args>(args)...)),
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_is_allocating(true),
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_size(size),
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_ti(lib.get_type_info<T>())
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{
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}
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template<typename T>
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template<typename ...Args>
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imported_class<T>::imported_class(detail::sequence<Args...> *, smart_library && lib, Args...args)
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: _lib(boost::move(lib)),
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_data(make_data<Args...>(lib, static_cast<Args>(args)...)),
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_is_allocating(false),
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_size(0),
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_ti(lib.get_type_info<T>())
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{
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}
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template<typename T>
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template<typename ...Args>
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imported_class<T>::imported_class(detail::sequence<Args...> *, smart_library && lib, std::size_t size, Args...args)
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: _lib(boost::move(lib)),
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_data(make_data<Args...>(lib, size, static_cast<Args>(args)...)),
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_is_allocating(true),
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|
|
_size(size),
|
||
|
|
_ti(lib.get_type_info<T>())
|
||
|
|
{
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
inline imported_class<T> boost::dll::experimental::imported_class<T>::copy() const
|
||
|
|
{
|
||
|
|
if (this->_is_allocating)
|
||
|
|
return imported_class<T>::template make<const T&>(_lib, *_data);
|
||
|
|
else
|
||
|
|
return imported_class<T>::template make<const T&>(_lib, _size, *_data);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
inline imported_class<T> boost::dll::experimental::imported_class<T>::move()
|
||
|
|
{
|
||
|
|
if (this->_is_allocating)
|
||
|
|
return imported_class<T>::template make<T&&>(_lib, *_data);
|
||
|
|
else
|
||
|
|
return imported_class<T>::template make<T&&>(_lib, _size, *_data);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
inline void boost::dll::experimental::imported_class<T>::copy_assign(const imported_class<T>& lhs) const
|
||
|
|
{
|
||
|
|
this->call<T&(const T&)>("operator=")(*lhs._data);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
inline void boost::dll::experimental::imported_class<T>::move_assign(imported_class<T>& lhs)
|
||
|
|
{
|
||
|
|
this->call<T&(T&&)>("operator=")(static_cast<T&&>(*lhs._data));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* Returns an instance of \ref imported_class which allows to call or import more functions.
|
||
|
|
* It takes a copy of the smart_libray, so no added type_aliases will be visible,
|
||
|
|
* for the object.
|
||
|
|
*
|
||
|
|
* Few compilers do implement an allocating constructor, which allows the construction
|
||
|
|
* of the class without knowing the size. That is not portable, so the actual size of the class
|
||
|
|
* shall always be provided.
|
||
|
|
*
|
||
|
|
* \b Example:
|
||
|
|
*
|
||
|
|
* \code
|
||
|
|
* auto import_class<class type_alias, const std::string&, std::size_t>(lib, "class_name", 20, "param1", 42);
|
||
|
|
* \endcode
|
||
|
|
*
|
||
|
|
* In this example we construct an instance of the class "class_name" with the size 20, which has "type_alias" as an alias,
|
||
|
|
* through a constructor which takes a const-ref of std::string and an std::size_t parameter.
|
||
|
|
*
|
||
|
|
* \tparam T Class type or alias
|
||
|
|
* \tparam Args Constructor argument list.
|
||
|
|
* \param lib Path to shared library or shared library to load function from.
|
||
|
|
* \param name Null-terminated C or C++ mangled name of the function to import. Can handle std::string, char*, const char*.
|
||
|
|
* \param mode An mode that will be used on library load.
|
||
|
|
*
|
||
|
|
* \return class object.
|
||
|
|
*
|
||
|
|
* \throw boost::system::system_error if symbol does not exist or if the DLL/DSO was not loaded.
|
||
|
|
* Overload that accepts path also throws std::bad_alloc in case of insufficient memory.
|
||
|
|
*/
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(const smart_library& lib_, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
smart_library lib(lib_);
|
||
|
|
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(const smart_library& lib_, Args...args)
|
||
|
|
{
|
||
|
|
smart_library lib(lib_);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(const smart_library& lib_, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
smart_library lib(lib_);
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(const smart_library& lib_, std::size_t size, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
smart_library lib(lib_);
|
||
|
|
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(const smart_library& lib_, const std::string & alias_name, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
smart_library lib(lib_);
|
||
|
|
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library && lib, Args...args)
|
||
|
|
{
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library && lib, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library && lib, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library && lib, std::size_t size, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library && lib, const std::string & alias_name, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(boost::move(lib), size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
* \note This function does add the type alias to the \ref boost::dll::experimental::smart_library.
|
||
|
|
*/
|
||
|
|
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library & lib, Args...args)
|
||
|
|
{
|
||
|
|
return imported_class<T>::template make<Args...>(lib, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
* \note This function does add the type alias to the \ref boost::dll::experimental::smart_library.
|
||
|
|
*/
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library & lib, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(lib, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
* \note This function does add the type alias to the \ref boost::dll::experimental::smart_library.
|
||
|
|
*/
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library & lib, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
return imported_class<T>::template make<Args...>(lib, size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
* \note This function does add the type alias to the \ref boost::dll::experimental::smart_library.
|
||
|
|
*/
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library & lib, std::size_t size, const std::string & alias_name, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(lib, size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*! \overload boost::dll::import_class(const smart_library& lib, std::size_t, Args...)
|
||
|
|
* \note This function does add the type alias to the \ref boost::dll::experimental::smart_library.
|
||
|
|
*/
|
||
|
|
template<typename T, typename ... Args> imported_class<T>
|
||
|
|
import_class(smart_library & lib, const std::string & alias_name, std::size_t size, Args...args)
|
||
|
|
{
|
||
|
|
lib.add_type_alias<T>(alias_name);
|
||
|
|
return imported_class<T>::template make<Args...>(lib, size, static_cast<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* BOOST_DLL_IMPORT_CLASS_HPP_ */
|