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110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Factory.h
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Copyright (C) 2015
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Copyright (C) 2016
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Author: Antonin Portelli <antonin.portelli@me.com>
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Author: Guido Cossu <guido.cossu@ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef Factory_hpp_
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#define Factory_hpp_
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namespace Grid{
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/******************************************************************************
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* abstract factory class *
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******************************************************************************/
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template <typename T, typename CreatorInput>
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class Factory
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{
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public:
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typedef std::function< std::unique_ptr<T> (const CreatorInput&) > Func;
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// constructor
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Factory(void) = default;
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// destructor
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virtual ~Factory(void) = default;
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// registration
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void registerBuilder(const std::string type, const Func &f);
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// get builder list
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std::vector<std::string> getBuilderList(void) const;
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// factory
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std::unique_ptr<T> create(const std::string type,
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const CreatorInput& input) const;
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private:
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std::map<std::string, Func> builder_;
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virtual std::string obj_type() const = 0;
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};
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/******************************************************************************
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* template implementation *
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******************************************************************************/
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// registration ////////////////////////////////////////////////////////////////
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template <typename T, typename CreatorInput>
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void Factory<T, CreatorInput>::registerBuilder(const std::string type, const Func &f)
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{
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builder_[type] = f;
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}
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// get module list /////////////////////////////////////////////////////////////
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template <typename T, typename CreatorInput>
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std::vector<std::string> Factory<T, CreatorInput>::getBuilderList(void) const
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{
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std::vector<std::string> list;
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for (auto &b: builder_)
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{
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list.push_back(b.first);
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}
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return list;
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}
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// factory /////////////////////////////////////////////////////////////////////
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template <typename T, typename CreatorInput>
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std::unique_ptr<T> Factory<T, CreatorInput>::create(const std::string type,
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const CreatorInput& input) const
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{
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Func func;
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std::cout << GridLogDebug << "Creating object of type "<< type << std::endl;
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try
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{
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func = builder_.at(type);
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}
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catch (std::out_of_range &)
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{
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//HADRON_ERROR("object of type '" + type + "' unknown");
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std::cout << GridLogError << "Error" << std::endl;
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std::cout << GridLogError << obj_type() << " object of name [" << type << "] unknown" << std::endl;
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exit(1);
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}
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return func(input);
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}
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}
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#endif // Factory_hpp_
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