Re: [Vala] Why is 77 greater than 4294967295?

[Heiher <root heiher info>]

Wow! Why the comparison behavior of a signed long with an unsigned int
isn't same as C/C++ in Vala?

if (i > uint.MAX)  => if (_tmp6_ > (G_MAXUINT))

On Fri, Nov 23, 2018 at 1:46 PM Michele Dionisio via vala-list
<vala-list gnome org> wrote:
> You are working on an architecture where long and int have the same size.
> And at the end you compare a long with an unsigned int. The unsigned int is
> converted to long and the maximum unsigned long is a negative signed long.
>
>
> Il giorno ven 23 nov 2018, 04:34 Jason Martin via vala-list <
> vala-list gnome org> ha scritto:
>
> > // simple vala code
> >
> > void main () {
> >
> >      long i = 77;
> >
> >      stdout.printf ("%ld\n", i);
> > // outputs 77
> >
> >      stdout.printf ("%u\n", uint.MIN);
> > // outputs 0
> >
> >      if (i < uint.MIN) {
> >          stdout.printf ("Never made it here.\n");
> >      }
> >
> >      stdout.printf ("%u\n", uint.MAX);
> > // outputs 4294967295
> > // G_MAXUINT
> >
> >      if (i > uint.MAX) {
> >          stdout.printf ("Why am I here.\n");
> >      }
> >
> > }
> >
> > valac --cc=gcc gbug.vala
> >
> >
> >
> > C code generated
> >
> > /* gbug.c generated by valac 0.40.11, the Vala compiler
> >   * generated from gbug.vala, do not modify */
> >
> >
> >
> > #include <glib.h>
> > #include <glib-object.h>
> > #include <stdio.h>
> >
> >
> >
> >
> > void _vala_main (void);
> >
> >
> > void
> > _vala_main (void)
> > {
> >      glong i = 0L;
> >      FILE* _tmp0_;
> >      glong _tmp1_;
> >      FILE* _tmp2_;
> >      glong _tmp3_;
> >      FILE* _tmp5_;
> >      glong _tmp6_;
> >      i = (glong) 77;
> >      _tmp0_ = stdout;
> >      _tmp1_ = i;
> >      fprintf (_tmp0_, "%ld\n", _tmp1_);
> >      _tmp2_ = stdout;
> >      fprintf (_tmp2_, "%u\n", 0);
> >      _tmp3_ = i;
> >      if (_tmp3_ < ((glong) 0)) {
> >          FILE* _tmp4_;
> >          _tmp4_ = stdout;
> >          fprintf (_tmp4_, "Never made it here.\n");
> >      }
> >      _tmp5_ = stdout;
> >      fprintf (_tmp5_, "%u\n", G_MAXUINT);
> >      _tmp6_ = i;
> >      if (_tmp6_ > ((glong) G_MAXUINT)) {
> >          FILE* _tmp7_;
> >          _tmp7_ = stdout;
> >          fprintf (_tmp7_, "Why am I here.\n");
> >      }
> > }
> >
> >
> > int
> > main (int argc,
> >        char ** argv)
> > {
> >      _vala_main ();
> >      return 0;
> > }
> >
> > _______________________________________________
> > vala-list mailing list
> > vala-list gnome org
> > https://mail.gnome.org/mailman/listinfo/vala-list
> _______________________________________________
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