Is there any way within a C or C++ program of getting information on all the functions that could be called? Perhaps a compiler macro of some sort? I know that there are programs that could take in source files or .o files and get the symbols or the prototypes, and I suppose I could just run those programs within a c program, but I'm curious about maybe returning function pointers to functions or an array of function prototypes available in the current scope, or something related?
I'm not phrasing this very well, but the question is part of my curiosity of what I can learn about a program from within the program (and not necessarily by just reading its own code). I kind of doubt that there is anything like what I'm asking for, but I'm curious.
Edit: It appears that what I was wondering about but didn't know how to describe very well was whether reflection was possible in C or C++. Thank you for your answers.
The language doesn't support reflection yet. However, since you are looking for some sources of information, take a look at the Boost.Reflect library to help you add reflection to your code, to a certain extent. Also, look at ClangTooling and libclang for libraries that let you do automated code-analysis.