[petsc-users] cannot convert ‘int*’ to ‘PetscInt*

[Dave May]

On Sunday, 16 October 2016, 丁老师 <ztdepyahoo at 163.com> wrote:

> Dear professor:
>    I met the following error for Petsc 3.7.3.
>    I delcare LocalSize as  int, but it doesn't work anymore. it works for
> 3.6.3.
>


This error has nothing to do with the version of petsc. Whether it "worked"
is dependent on the size of PetscInt which is configure/architecture
dependent


>
>
>    error: cannot convert ‘int*’ to ‘PetscInt* {aka long int*}’ for
> argument ‘2’ to ‘PetscErrorCode VecGetLocalSize(Vec, PetscInt*)’
>    VecGetLocalSize (Petsc_b, &LocalSize);
>
> Regards
>


So just fix your code and declare LocalSize as a PetscInt.

If you insist on representing it as an int (which in general is unsafe as
PetscInt might be a 32-bit or 64-bit int), define a new variable and cast
LocalInt to int


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