putting function definitions in header files

Question

If you want to put function definitions in header files, it appears there are three different solutions:

1. mark the function as inline
2. mark the

Answer 1

static functions (equivalent to anonymous namespace) receive different copies for each TU. If the function is re-entrant this is basically identical (some compilers might have assembly-level differences) but if it isn't then it will have different static data for each TU. Inline functions are folded- that is, they have only one copy of static data for every TU.