PetscIntMultError#

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

Synopsis#

static inline PetscErrorCode PetscIntMultError(PetscInt a, PetscInt b, PetscInt *result)

Not Collective; No Fortran Support

Input Parameters#

a - the PetscInt value
b - the second value

Output Parameter#

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

Notes#

Use PetscInt64Mult() to compute the product of two PetscInt and store in a PetscInt64

Use PetscIntMultTruncate() to compute the product of two PetscInt and truncate it to fit in a PetscInt

Developer Note#

In most places in the source code we currently assume that PetscInt addition does not overflow, this is obviously wrong but requires many more checks. PetscIntSumError() can be used to check for this situation.

Level#

advanced

Location#

include/petscsys.h

Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages