http://d.puremagic.com/issues/show_bug.cgi?id=622

           Summary: There should be a warning for unininitalized class
                    reference
           Product: D
           Version: 0.175
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: andkhropov@mtu-net.ru


This error is very common for people with C++ background (I've already seen people asking questions about similar code several times):
----------------------------------------------
class Foo{
  public int data;
}

void main()
{
  Foo f; // obviously they try do this way as they got used to it in C++
         // should be a warning here!

  f.data = 1;// Access violation
}

----------------------------------------------


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=622


wbaxter@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wbaxter@gmail.com




------- Comment #1 from wbaxter@gmail.com  2006-11-30 18:16 -------
Yes please!  I make this mistake all the time, and every time it takes a few minutes tracking down why and where my program is crashing.


-- 

d-bugmail@puremagic.com escribió:
> http://d.puremagic.com/issues/show_bug.cgi?id=622
> 
>            Summary: There should be a warning for unininitalized class
>                     reference
>            Product: D
>            Version: 0.175
>           Platform: PC
>         OS/Version: Windows
>             Status: NEW
>           Severity: enhancement
>           Priority: P2
>          Component: DMD
>         AssignedTo: bugzilla@digitalmars.com
>         ReportedBy: andkhropov@mtu-net.ru
> 
> 
> This error is very common for people with C++ background (I've already seen
> people asking questions about similar code several times):
> ----------------------------------------------
> class Foo{
>   public int data;
> }
> 
> void main()
> {
>   Foo f; // obviously they try do this way as they got used to it in C++
>          // should be a warning here!
> 
>   f.data = 1;// Access violation
> }
> 
> ----------------------------------------------
> 
> 

Actually, the warning should be in "f.data = 1;". You are trying to access a member of an uninitialized variable. Take a look at this code:

----------------------------------------------
Foo f;
if (something) {
    f = new Foo();
} else {
    f = new Bar();
}

f.data = 1;
----------------------------------------------

(where Bar extends Foo, for example). No warning should be generated, everyhing in it's place. That's the way access to uninitialized variable in java works. They are errors, not just warnings (the program will crash there, no matter what happens).

http://d.puremagic.com/issues/show_bug.cgi?id=622


bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #3 from bearophile_hugs@eml.cc 2010-04-12 12:00:02 PDT ---
This bug is half-fixed: the compiler is now able to catch this bug at
compile-time, but only if the code is compiled with -O.
I think the compiler has to catch this bug when not optimized mode is used too.

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http://d.puremagic.com/issues/show_bug.cgi?id=622


Andrei Alexandrescu <andrei@metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei@metalanguage.com
         AssignedTo|nobody@puremagic.com        |bugzilla@digitalmars.com


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