[petsc-dev] PETSC_COMM_WORLD declaration

[Marco Zocca]

What does this declaration in petscsys.h do?

What type and value does PETSC_COMM_WORLD expand to?



#define PETSC_EXTERN extern PETSC_VISIBILITY_PUBLIC

PETSC_EXTERN MPI_Comm PETSC_COMM_WORLD;


Thank you in advance,
Marco