Tutorial 0 for C++ modular application

app.cpp

#include <dlfcn.h>
#include <iostream>

int main(int argc, char ** argv)
{
	if (argc == 1)
	{
		std::cerr << "Usage: " << argv[0] << " modules...\n";
		return 1;
	}
	
	for (int i = 1; i < argc; ++i)
	{
		void* shared_library = dlopen(argv[i], RTLD_LAZY);
		void (*module)() = reinterpret_cast<void (*)()>(dlsym(shared_library, "module"));
		if (module)
		{
			module();
			dlclose(shared_library);
		} else
		{
			std::cerr << "Error while loading: " << argv[i] << "\n";
		}
	}
	return 0;
}

module_other.cpp

#include <iostream>

extern "C" void module()
{
	std::cout << "Other module function!\n";
}

module_start.cpp

#include <iostream>

extern "C" void module()
{
	std::cout << "Start module function!\n";
}