Here is method to put classes names inside a vector. Leave a comment if I missed important details. I don’t think it will work for templates, though.
struct MyClasses {
static vector<string> myclasses;
MyClasses(string name) { myclasses.push_back(name); }
};
#define REGISTER_CLASS(cls) static MyClasses myclass_##cls(#cls);
struct XYZ {
};
REGISTER_CLASS(XYZ);
The trick here is to make some computation before main() is called and you can achieve this via global initialization. REGISTER_CLASS(cls) actually generates code to call the constructor of MyClasses at program startup.
UPDATE: Following gf suggestion you can write this:
#define REGISTER_CLASS(cls) temp_##cls; static MyClasses myclass_##cls(#cls); class cls
class REGISTER_CLASS(XYZ) { int x, y, z; }