65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
/*
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* A Generic Abstract Factory Pattern Implementation
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* Nana C++ Library(http://www.nanapro.org)
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* Copyright(C) 2003-2014 Jinhao(cnjinhao@hotmail.com)
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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 or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* @file: nana/pat/abstract_factory.hpp
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* @description: A generic easy-to-use abstract factory pattern implementation
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*/
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#ifndef NANA_PAT_ABSFACTORY_HPP
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#define NANA_PAT_ABSFACTORY_HPP
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#include "cloneable.hpp"
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#include <memory>
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namespace nana
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{
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namespace pat
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{
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namespace detail
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{
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//A Base class for abstract factory, avoids decorated name length exceeding for a class template.
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class abstract_factory_base
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{
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public:
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virtual ~abstract_factory_base() = default;
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};
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}
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template<typename Interface>
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class abstract_factory
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: public detail::abstract_factory_base
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{
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public:
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using interface_type = Interface;
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virtual ~abstract_factory() = default;
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virtual std::unique_ptr<interface_type> create() = 0;
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};
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namespace detail
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{
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template<typename T, typename Interface>
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class abs_factory
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: public abstract_factory<Interface>
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{
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std::unique_ptr<Interface> create() override
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{
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return std::unique_ptr<Interface>{ new T };
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}
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};
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}//end namespace detail
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template<typename Type>
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pat::cloneable<abstract_factory<typename Type::factory_interface>> make_factory()
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{
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return detail::abs_factory<Type, typename Type::factory_interface>();
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}
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}//end namespace pat
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}//end namespace nana
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#endif
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