factory.hpp

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#pragma once
 
namespace itk {
 
  class CoreFactory {
  public:
    virtual ~CoreFactory() = default;
 
    virtual void set_default() = 0;
  }; // CoreFactory
 
 
  inline void set_factory(CoreFactory& factory) {
    factory.set_default();
  }
 
 
  template<typename T>
  class Factory : public CoreFactory {
  public:
    using Base = T;
    inline static Factory* maker = nullptr;
 
    void set_default() override {
      maker = this;
    }
  };
 
  template<typename T, typename... Args>
  T* make(Args & ... args) {
    auto maker = reinterpret_cast<T::Factory*>(T::Factory::maker);
    return (*maker)(args...);
  }
 
} // itk