Difference between automatic arrays on the heap and allocatable arrays

[PierU]

@RonShepard

As far as the API is concerned, another approach is to make the work(:) array optional. Then the routine can use it if present(), and otherwise it can use is own workspace.

But then you will likely duplicate a lot of code depending on which one is used, or you will use a pointer to avoid the duplication, which is not fully satisfactory either.

@RonShepard

I still think a good compiler at run time should first try the stack, and if that fails it should use heap

I agree. But when releasing source code, you have no control on which compiler (a “good one” or not) will be used