NULL arguments to fortran about maestroex HOT 4 CLOSED

The capability of optional argument in bind(c) routines is a Fortran 2015 feature. Some compilers might support it. Some might not.

My suggestion is create a one-cell IArrayBox and pass that in case of null mask. You can also pass an integer flag indicating whether the mask is null or not.

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Also note C does not support optional argument. That's why the type check tool fails.

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Note that after the tiling merge, the mask stuff for multilevel does not work correctly since the mask incorrectly assumes the shape of the tilebox in fortran, instead of passing in the lo/hi bounds of the entire FAB. So for example, in MaestroReact we need to fix how the mask is passed in to burner_loop(). We also need to implement Weiqun's idea above in order for this to work; otherwise there would be extra optional arguments entering for the mask lo/hi bounds.

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Fixed all the mask argument and made them required.

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