[Issue 4554] Cyclic constructor calls cause stack overflow

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4554


Don <clugdbug at yahoo.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |clugdbug at yahoo.com.au


--- Comment #1 from Don <clugdbug at yahoo.com.au> 2010-08-13 22:51:00 PDT ---
(In reply to comment #0)
> On this page:
> 
> http://www.digitalmars.com/d/2.0/class.html
> 
> It states "It is illegal for constructors to mutually call each other". This
> will compile and cause a stack overflow:
> 
> import std.stdio;
> 
> class C {
>     this() { this(1); }
>     this(int i) { this(); }    // illegal, cyclic constructor calls
> }
> 
> void main() {
>     C c = new C;
> }
> 
> object.Error: Stack Overflow
> 
> Isn't it possible to make this a compiler error? Or maybe this is a form of a
> halting-problem and can't be fixed? :)

I guess the compiler could set up a dependency tree of constructor calls, and
check for cycles. Quite a bit of work.

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