Is there any way to compile additional code at runtime in C or C++?

Question

Here is what I want to do:

1. Run a program and initialize some data structures.
2. Then compile additional code that can access/modify the existing data st

Answer 1

I think you may be able to accomplish this using dynamic libraries and loading them at runtime (using dlopen and friends).

void * lib = dlopen("mynewcode.so", RTLD_LAZY);
if(lib) {
    void (*fn)(void) = dlsym(lib, "libfunc");

    if(fn) fn();
    dlclose(lib);
}

You would obviously have to be compiling the new code as you go along, but if you keep replacing mynewcode.so I think this will work for you.