LibraryWrapper.hpp

#ifndef LIBRARY_WRAPPER_HPP
#define LIBRARY_WRAPPER_HPP

#include <cstdlib>
#include <dlfcn.h>

template <class T> class LibraryWrapper: public T {

    private:
        static std::string name;
        static void* handle; // link to opened library

    protected:
        T* data; // actual data

    public:
        LibraryWrapper(const std::string libname) {
            if (LibraryWrapper<T>::handle == NULL) {
                std::string fullname = "./lib" + libname + ".so";
                LibraryWrapper<T>::handle = dlopen(fullname.c_str(), RTLD_LAZY);
                if (LibraryWrapper<T>::handle == NULL) {
                    std::cout << dlerror() << std::endl;
                    std::exit(EXIT_FAILURE);
                }
                LibraryWrapper<T>::name = libname;
                std::cout << "Handle loaded\n";
            }
            T* (*create)();
            std::string init = "create_" + LibraryWrapper<T>::name;
            create = (T* (*)())dlsym(LibraryWrapper<T>::handle, init.c_str());
            this->data = (T*)create();
        }
        ~LibraryWrapper() {
            void (*destroy)(T*);
            std::string fin = "destroy_" + LibraryWrapper<T>::name;
            destroy = (void (*)(T*))dlsym(LibraryWrapper<T>::handle, fin.c_str());
            destroy(this->data);
        }

};

template<class T> std::string LibraryWrapper<T>::name = "";
template<class T> void* LibraryWrapper<T>::handle = NULL;

#endif