http://d.puremagic.com/issues/show_bug.cgi?id=7984
Summary: why is there a hidden field this in nested struct with
non-static methods
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: thelastmamm...@gmail.com
--- Comment #0 from thelastmamm...@gmail.com 2012-04-25 00:27:20 PDT ---
Why is there a hidden field "this" in a struct with non-static methods that is
defined in a function?
given:
void myfunction(){
struct C1{int n; }
struct C2{int n; void fun(){}}
writeln(C1.init); //prints C(0)
writeln(C1.init.sizeof); //prints 4
writeln(C2.init); //prints C(0,null)
writeln(C2.init.sizeof); //prints 8 (on 32bit)
}
In visualD, C2 appears as {n=0 this=0x00000000 }. this only occurs when C2 has
at least 1 non-static method.
* Why is this, since C2 seems to be a POD ?
* the "this" field seems to be always 0x00000000 (from inspection in visualD)
* the hidden extra field (and extra size) disappears when C2 is not defined
inside a function, or is defined in a class.
I couldn't find any related info in the book nor the docs.
Thanks!
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