Control: reopen -1 On 2016-02-07 20:26:22 -0500, James McCoy wrote: > On Sun, Jan 24, 2016 at 07:24:54AM +0100, Vincent Lefevre wrote: > > In a string context, undef is the empty string. > > No, an empty string is an empty string. undef is the lack of an > argument. The same thing happens if you call a function in Perl without > any arguments.
So, then, if you want, this should be seen as an error, but this is not the usual behavior (e.g. perl -e 'print undef eq ""' outputs 1). > > No, undef must not be the null pointer. > > Yes, it should. If the library doesn't expect a null pointer, it certainly must not. > > This makes no sense at all! > > With a string argument, undef must be the empty string. > > No, it mustn't. That isn't even the case in Perl, so I don't see why it > should convert to C. It is the case in Perl (see example above). Anyway, there are two correct behaviors: 1. Stringify the argument. 2. Return an error if the argument is not a string. In Perl, a segmentation fault is a bug. -- Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
