PetscErrorCode PetscBinaryWrite(int fd,void *p,PetscInt n,PetscDataType type,PetscBool istemp)Not Collective
|fd||- the file|
|p||- the buffer|
|n||- the number of items to write|
|type||- the type of items to read (PETSC_INT, PETSC_DOUBLE or PETSC_SCALAR)|
|istemp||- PETSC_FALSE if buffer data should be preserved, PETSC_TRUE otherwise.|
If running with __float128 precision the output is in __float128 unless one uses the -binary_write_double option
The Buffer p should be read-write buffer, and not static data. This way, byte-swapping is done in-place, and then the buffer is written to the file.
This routine restores the original contents of the buffer, after it is written to the file. This is done by byte-swapping in-place the second time. If the flag istemp is set to PETSC_TRUE, the second byte-swapping operation is not done, thus saving some computation, but the buffer is left corrupted.
Because byte-swapping may be done on the values in data it cannot be declared const