testcase

When writing GenExpr code I have found it very useful to have History operators defined in a function like so:

gran_voice(buf, chan, window, pitch, speed, grain_randomness, grain_length, phase) {
    History hold_val(0);
    History win_index(0);
    History buf_index(0);
    History rand_offset(0);

....

}

This allows for the functions to carry around an internal state and makes them somewhat quasi-closures. This makes the functions I am defining in a .genexpr library far more portable and easy to deal with. I can see in the exported C++ code the State structure contains these as fields with various numbers appended to them. It would be nice to be able to access these internal History operators in GenExpr but I can't see a way to do this and I assume it would be difficult based on the way the exported C++ code is setup or would require functors and some changes that might slow things down. Is my assumption correct with this?

gen-and-history-in-functions

Partly. Because it is a closure, each instance of gran_voice() in the GenExpr code will create new History memory in the generated code, hence the auto-naming. However this is partly an implementation detail; e.g. in earlier implementations we generated functor structs. We want to preserve the possibility of changing the implementation in the future too: it's not clear yet what the optimal implementation is, and thus what kind of interface it could support.

It would be nice if functions were first class values and there was a mechanism for accessing internal history objects but it doesn't seem very compatible with the current paradigm which has the advantage of seeming to be very fast.

gen and History in functions