I think checking if (the_datum != null) should do Em sáb, 16 de fev de 2019 10:00, <vala-list-requ...@gnome.org escreveu:
> Send vala-list mailing list submissions to > vala-list@gnome.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://mail.gnome.org/mailman/listinfo/vala-list > or, via email, send a message with subject or body 'help' to > vala-list-requ...@gnome.org > > You can reach the person managing the list at > vala-list-ow...@gnome.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of vala-list digest..." > > > Today's Topics: > > 1. error: use of possibly unassigned local variable (Vivien Kraus) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 15 Feb 2019 21:28:45 +0100 > From: Vivien Kraus <viv...@planete-kraus.eu> > To: vala-list@gnome.org > Subject: [Vala] error: use of possibly unassigned local variable > Message-ID: > <40a1141df0d06b59ed0f87f3a6cafac285f45b4a.ca...@planete-kraus.eu> > Content-Type: text/plain; charset="UTF-8" > > Hello list, > > I am facing an inconvenient problem. > > Suppose I have a C library, that I want to use from vala: > > // Always return true > extern bool lib_initialized (); > > // data is always set when work returns true > extern bool lib_work (out int data); > > int main(string[] args) { > int the_datum; > bool has_datum = (lib_initialized () && lib_work (out the_datum)); > if (has_datum) { > stdout.printf ("Hello, %d!\n", the_datum); > } > return 0; > } > > If I am to compile this (0.42.5, -C only, not link), I get an error > message: > > test.vala:11.3-11.44: error: use of possibly unassigned local variable > `the_datum' > stdout.printf ("Hello, %d!\n", the_datum); > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Compilation failed: 1 error(s), 0 warning(s) > > The workaround is obvious: initialize the_datum. However, I like to run > my code under valgrind to detect when reading > from an uninitialized variable (I make lots of mistakes ^^), and so if > there is a bug in lib_work and I initialize > the_datum, then I will not be able to notice the problem. > > Is it possible to instruct valac that it should not worry? Or is it > possible to change this error to a simple warning? > > Best regards > > Vivien > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > vala-list mailing list > vala-list@gnome.org > https://mail.gnome.org/mailman/listinfo/vala-list > > > ------------------------------ > > End of vala-list Digest, Vol 133, Issue 6 > ***************************************** > _______________________________________________ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
