[Issue 4832] Functions external to class break immutability

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4832



--- Comment #1 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2010-09-06 13:37:55 PDT ---
Sorry, I meant the function foo, not bar.

(In reply to comment #0)
> Code:
> 
> import std.stdio : writeln;
> 
> void foo(ref int x)
> {
>     x = 10;
> }
> 
> class Bar
> {
>     immutable int x;
> 
>     this()
>     {
>         x = 5;
>     }
> 
>     void printMe()
>     {
>         writeln(this.x);
>     }
> 
>     void change()
>     {
>         //~ this.x = 20;    // illegal, errors out
>     }
> }
> 
> void main()
> {
>     Bar bar = new Bar;
>     bar.printMe();  // prints 5
> 
>     //~ bar.x = 10;  // illegal, errors out
> 
>     foo(bar.x);     // no error!
>     bar.printMe();  // prints 10
> }
> 
> The commented out code would error out at compile time, which is expected. But
> the function bar() is breaking immutability of x.
> 
> A relevant bug is bug 4416 , and my comment:
> http://d.puremagic.com/issues/show_bug.cgi?id=4416#c1

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