[petsc-users] passing an object to function

[Dominik Szczerba]

> On Fri, Oct 7, 2011 at 11:09, Dominik Szczerba <dominik at itis.ethz.ch> wrote:
>>
>> Sorry, I could not conclude: so what signature to pass an object is
>> best/cleanest/most optimal for my C++ code?
>
> Prefer Vec

If I do so (instead of Vec& that I started with), I receive segfaults.
An example function:

foo(const Vec& v1, Vec& v2)
{
  // allocate v2 and fill it it depending on v1)
}

Calling sequence;

Vec v1;
// create and fill v1;
Vec v2; // creation expected in foo()
foo(v1,v2);
// Now do VecGetArray on v2

This will work as expected only if the signature for foo is Vec&. When
replaced with Vec I get segfaults on VecGetArray trying to access v2
after calling foo, suggesting an attempt to access invalid memory
location.

Did I miss anything?

Many thanks, Dominik