[petsc-users] passing an object to function

[Jed Brown]

On Fri, Oct 7, 2011 at 04:45, Dominik Szczerba <dominik at itis.ethz.ch> wrote:

> I need to do something with - say - a Vec in a function but obviously
> do not want to copy by value. Should the signature be foo(Vec) or
> foo(Vec&)?
>

PETSc does not use C++ internally.


> I see Vec is a pointer in itself, so Vec should suffice,
> but in many Petsc functions I see Vec& signatures,
>

No, you see some Vec* signatures, not Vec&. Vec* is used when a new Vec is
created, if the function needs to modify the pointer, or if the argument is
an array of Vecs.
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