Car.h

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#pragma once
 
#include "gdl.h"
 
class Car {
public:
    virtual void go() = 0;
 
    virtual ~Car() = default;
 
    void set_loggers([[ maybe_unused ]] GOptions* const g) {}
 
    double generalCarVar = 44;
 
    // method to dynamically load factories
    static Car *instantiate(const dlhandle handle) {
 
        if (handle == nullptr) return nullptr;
 
        // must match the extern C declaration in the derived factories
        void *maker = dlsym(handle, "CarFactory");
 
        if (maker == nullptr) return nullptr;
 
        typedef Car *(*fptr)();
 
        // static_cast not allowed here
        // see http://stackoverflow.com/questions/573294/when-to-use-reinterpret-cast
        // need to run the DLL CarFactory function that returns the factory
        fptr func = reinterpret_cast<fptr>(reinterpret_cast<void *>(maker));
 
        return func();
    }
};