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 ]] const std::shared_ptr<GOptions>&  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();
    // }
 
    static Car* instantiate(const dlhandle h, std::shared_ptr<GOptions> g) {
        if (!h) return nullptr;
        using fptr = Car* (*)(std::shared_ptr<GOptions>);
 
        // Must match the extern "C" declaration in the derived factories.
        auto sym   = dlsym(h, "CarFactory");
        if (!sym) return nullptr;
 
        auto func = reinterpret_cast<fptr>(sym);
        return func(g);
    }
 
};