90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
/**
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* @file FactoryBase.h
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* File contains the FactoryBase class declarations.
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*/
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#ifndef CT_FACTORY_BASE
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#define CT_FACTORY_BASE
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#include <vector>
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#include <mutex>
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#include <unordered_map>
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#include "cantera/base/ctexceptions.h"
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namespace Cantera
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{
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//! Base class for factories.
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/*!
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* This class maintains a registry of all factories that derive from it, and
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* deletes them all when its static method deleteFactories is invoked.
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*/
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class FactoryBase
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{
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public:
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//! destructor
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virtual ~FactoryBase() {
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}
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//! static function that deletes all factories in the internal registry
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//! maintained in a static variable
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static void deleteFactories() {
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for (const auto& f : s_vFactoryRegistry) {
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f->deleteFactory();
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}
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s_vFactoryRegistry.clear();
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}
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protected:
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//! Constructor.
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/*!
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* Adds the current object to the current static list
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*/
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FactoryBase() {
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s_vFactoryRegistry.push_back(this);
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}
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//! Virtual abstract function that deletes the factory
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/*!
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* This must be properly defined in child objects.
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*/
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virtual void deleteFactory() = 0;
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private:
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//! statically held list of Factories.
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static std::vector<FactoryBase*> s_vFactoryRegistry;
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};
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//! Factory class that supports registering functions to create objects
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//!
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//! Template arguments for the class are the base type created by the factory,
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//! followed by the types of any arguments which need to be passed to the
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//! functions used to create objects, e.g. arguments to the constructor.
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template <class T, typename ... Args>
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class Factory : public FactoryBase {
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public:
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virtual ~Factory() {}
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//! Create an object using the object construction function corresponding to
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//! "name" and the provided constructor arguments
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T* create(const std::string& name, Args... args) {
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try {
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return m_creators.at(name)(args...);
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} catch (std::out_of_range&) {
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throw CanteraError("Factory::create", "No such type: '{}'", name);
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}
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}
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//! Register a new object construction function
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void reg(const std::string& name, std::function<T*(Args...)> f) {
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m_creators[name] = f;
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}
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protected:
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std::unordered_map<std::string, std::function<T*(Args...)>> m_creators;
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};
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}
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#endif
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