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aka_factory.hh
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/**
* @file aka_factory.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Sun Jul 09 2017
* @date last modification: Fri Dec 08 2017
*
* @brief This is a generic factory
*
*
* Copyright (©) 2016-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
/* -------------------------------------------------------------------------- */
#include <functional>
#include <map>
#include <memory>
#include <string>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_FACTORY_HH_
#define AKANTU_AKA_FACTORY_HH_
namespace akantu {
template <class Base, class T = ID, class... Args> class Factory {
using allocator_t = std::function<std::unique_ptr<Base>(Args...)>;
private:
Factory() = default;
public:
Factory(const Factory &) = delete;
Factory & operator=(const Factory &) = delete;
static Factory & getInstance() {
static Factory instance;
return instance;
}
/* ------------------------------------------------------------------------ */
bool registerAllocator(const T & id, const allocator_t & allocator) {
if (allocators.find(id) != allocators.end()) {
AKANTU_EXCEPTION("The id "
<< " is already registered in the "
<< debug::demangle(typeid(Base).name()) << " factory");
}
allocators[id] = allocator;
return true;
}
template <typename... AArgs>
std::unique_ptr<Base> allocate(const T & id, AArgs &&... args) const {
if (allocators.find(id) == allocators.end()) {
AKANTU_EXCEPTION("The id "
<< " is not registered in the "
<< debug::demangle(typeid(Base).name()) << " factory.");
}
return std::forward<std::unique_ptr<Base>>(
allocators.at(id)(std::forward<AArgs>(args)...));
}
std::vector<T> getPossibleAllocators() {
std::vector<T> keys;
for (auto & e : allocators) {
keys.push_back(e.first);
}
return keys;
}
private:
std::map<T, allocator_t> allocators;
};
} // namespace akantu
#endif /* AKANTU_AKA_FACTORY_HH_ */

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