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digitalmars.D.bugs - [Issue 5679] New: Type aliasing "this" from an access function defined in base class confuses the compiler about the type of objects

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5679

           Summary: Type aliasing "this" from an access function defined
                    in base class confuses the compiler about the type of
                    objects
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: puneet coverify.org


--- Comment #0 from Puneet Goel <puneet coverify.org> 2011-03-01 17:58:45 PST
---
Type aliasing "this" from an access function defined in base class
confuses the compiler about the type of objects. Please see the
reduced test case that I have appended below. I am using dmd2
version 2.052 on a Linux box.

//// file alias_test.d
import std.stdio;
class Foo {
 public int f = 42;
 public void print()  {
   writeln(f);
 }
}
class Base {
 Foo foo;
  property protected final getFoo()  {
   if(foo is null) foo = new Foo();
   return foo;
 }
}
class Derived: public Base {
 alias getFoo this;
}
void main() {
 Derived[] dl;
 Derived d = new Derived();
 d.print(); // prints 42
 writeln("Type of d1 is: ",
         typeid(typeof(d))); // prints Type of d1 is: alias_test.Derived
 dl ~= d; // Error: cannot append type alias_test.Base to type Derived[]
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5679


SomeDude <lovelydear mailmetrash.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lovelydear mailmetrash.com


--- Comment #1 from SomeDude <lovelydear mailmetrash.com> 2012-04-22 23:38:39
PDT ---
After changing
class Derived: public Base {
by
class Derived: Base {
in line 15 to remove the deprecation error, the sample compiles and runs fine
on 2.059.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid


--- Comment #2 from Kenji Hara <k.hara.pg gmail.com> 2012-06-01 00:49:34 PDT ---
(In reply to comment #1)

 After changing
 class Derived: public Base {
 by
 class Derived: Base {
 in line 15 to remove the deprecation error, the sample compiles and runs fine
 on 2.059.


This issue was unintentionally fixed in 2.059, but appears in 2.060head again.

https://github.com/D-Programming-Language/dmd/pull/972

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--- Comment #3 from github-bugzilla puremagic.com 2012-11-19 23:18:44 PST ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/f633fb87736eafe265fe61b34415b99ccfb604af
fix Issue 5679 - Type aliasing "this" from an access function defined in base
class confuses the compiler about the type of objects

https://github.com/D-Programming-Language/dmd/commit/ea0e58bbb20fdd36e8357ae4242458f3835d33b5
Merge pull request #972 from 9rnsr/fix5679

Issue 5679 - Type aliasing "this" from an access function defined in base class
confuses the compiler about the type of objects

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Nov 19 2012
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5679


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


--- Comment #4 from Kenji Hara <k.hara.pg gmail.com> 2012-12-04 18:29:40 PST ---
(In reply to comment #3)

 Commits pushed to master at https://github.com/D-Programming-Language/dmd
 
 https://github.com/D-Programming-Language/dmd/commit/f633fb87736eafe265fe61b34415b99ccfb604af
 fix Issue 5679 - Type aliasing "this" from an access function defined in base
 class confuses the compiler about the type of objects
 
 https://github.com/D-Programming-Language/dmd/commit/ea0e58bbb20fdd36e8357ae4242458f3835d33b5
 Merge pull request #972 from 9rnsr/fix5679
 
 Issue 5679 - Type aliasing "this" from an access function defined in base class
 confuses the compiler about the type of objects


Once the change was reverted, but re-merged.

https://github.com/D-Programming-Language/dmd/commit/50fbab4536013314d4500f951928d3f2514bcac4

Finally, the issue was fixed.

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