Re: arrays, pointers, and constness

On Nov 9, 2007 8:04 AM, Axel Naumann <Axel.Naumann_at_cern.ch> wrote:
> Hi Annalisa,
>
>
> Annalisa De Caro wrote:

> > When I made the following:
> > .L proviamo.C++
> > the compilation stops with the following message:
> > ./proviamo.C:31: error: cannot convert `const Float_t (*)[3]' to `Float_t*' in initialization
>
> You have an array of "const Float_t"s, and you try to set ccc (a pointer
> to a Float_t) by making it point to the array. That won't work; ccc
> doesn't respect the const-ness of the array values: the array has const
> Float_t, ccc doesn't. Make it "const Float_t *ccc" instead.

I didn't notice the const-ness of the initial array; of course Axel is correct to point this out. So in your second example, you really should have

const Float_t * ccc = fgkAl3parameters;

(again, omitting the & operator).

best regards,

-- 
Kevin B. McCarty <kmccarty_at_princeton.edu>   Physics Department
WWW: http://www.princeton.edu/~kmccarty/    Princeton University
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