petsc-3.8.4 2018-03-24
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PetscIntMultError

 Computes the product of two positive PetscInt and generates an error with overflow.

Synopsis

PETSC_STATIC_INLINE PetscErrorCode PetscIntMultError(PetscInt a,PetscInt b,PetscInt *result)
Not Collective

Input Parameter

a - the PetscInt value
b - the second value

Output Parameter:ma

result -the result as a PetscInt value, or NULL if you do not want the result, you just want to check if it overflows

Use PetscInt64Mult() to compute the product of two 32 bit PetscInt and store in a PetscInt64 Use PetscIntMultTruncate() to compute the product of two PetscInt and truncate it to fit in a PetscInt

Developers Note: We currently assume that PetscInt addition does not overflow, this is obviously wrong but requires many more checks.

See Also

PetscBLASInt, PetscMPIInt, PetscInt, PetscBLASIntCast(), PetscIntMult64(), PetscIntSumError()

Level:advanced
Location:include/petscsys.h
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages