Re: SWIG: Bug with 'C' arrays of zero size ?

On Fri, 12 Jun 2020 at 09:37, Terry Barnaby <[email protected]> wrote:

> Hi,
>
> If you have a data structure like the following all is well:
>
> struct DataBlock {
>      Header    header;
>      char        data[4];    ///< The packet data
> };
>
> However if you have a data structure that has a zero length array like
> the following, SWIG considers the "char data[]" as a pointed to data and
> tries to delete[] and allocate memory for it.
>
> struct DataBlock {
>     Header    header;
>      char        data[];    ///< The packet data
> };
>
> I think this is a bug ?
>
>
Hi Terry

This is a pointer to an undetermined array of char characters. By default
SWIG chooses to wrap this a pointer to a NULL terminated array of
characters, that is, a string. There is no bug here!

You can use typemaps to change the behaviour to whatever you want.

William


On Fri, 12 Jun 2020 at 09:37, Terry Barnaby <[email protected]> wrote:

> Hi,
>
> If you have a data structure like the following all is well:
>
> struct DataBlock {
>      Header    header;
>      char        data[4];    ///< The packet data
> };
>
> However if you have a data structure that has a zero length array like
> the following, SWIG considers the "char data[]" as a pointed to data and
> tries to delete[] and allocate memory for it.
>
> struct DataBlock {
>     Header    header;
>      char        data[];    ///< The packet data
> };
>
> I think this is a bug ?
>
> Terry
>
>
>
> _______________________________________________
> Swig-user mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/swig-user
>

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