Re: boost::function question

[Angus Leeming]

On Monday 21 October 2002 5:36 pm, Andre Poenitz wrote:
> On Mon, Oct 21, 2002 at 05:30:02PM +0100, Angus Leeming wrote:
> > Sorry, I should point out that this dies:
> >     typedef boost::function2<int, const char *, char *const []>
> > but this is Ok:
> >     typedef boost::function2<int, const char *, char *const *>
> >
> > Any ideas?
>
> foo[] _is_ different from foo*.
>
> Often [] 'collapses' to *, but when determining the signature
> of the template it does not.
>
> For a fixed number of entries you could use
>
>       typedef boost::function2<int, const char *, char *const [10]>
>       typedef boost::function2<int, const char *, char *const [20]>
>
> etc, but for  "the other cases" you have to "collaps"
> yourself. "unspecified" length as in  char *const []  is not
> possible.
>
> But I am here on shaky ground, this is all "I think, IMO,
> maybe..."
>
> Andre'

Hmmm. Try this minimal test case:
Angus

#include <boost/function/function2.hpp>
#include <unistd.h>

int main ()
{
        const int MAX_ARGV = 255;
        char *syscmd = 0;
        char *argv[MAX_ARGV];

        // works
        // typedef boost::function2<int, const char *, char * const *> func_type;
        // triggers internal compiler error
        typedef boost::function2<int, const char *, char * const [255]> func_type;

        func_type func = execvp;
        func(syscmd, argv);
        
        return 0;
}