• d-bugmail puremagic.com (43/43) Jan 22 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7347

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=7347

           Summary: scope storage class destruction & allocation issues
           Product: D
           Version: D1 & D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: verylonglogin.reg gmail.com


--- Comment #0 from Denis <verylonglogin.reg gmail.com> 2012-01-22 20:15:25 MSK
---
---
import std.stdio;

class C {
    int n;
    this(int n) { writefln(" this(%s) at %s", this.n = n, cast(void*)this); }
    ~this() { writefln("~this(%s) at %s", n, cast(void*)this); }
}

void main() {
    int i;
    writefln("Stack is at %s", &i);
    writefln("Heap  is at %s", (new void[1]).ptr);
    {
        C cHeap = new C(0); // will be destroyed on scope exit
        scope C c0 = cHeap;

        // C(1)-C(4) will be allocated in heap
        // C(1), C(2), and C(4) will be destroyed on scope exit
        // C(3) will be destroyed on garbage collection
        scope C c1 = cast(C)cast(void*)new C(1);
        scope C c2 = true ? new C(2) : null;
        scope C c3 = (new C(3), new C(4));
    }
    writefln("after scope");
}
---
As a result even if `C` is a `scope class` the program will compile without
`cHeap` and `c0`, but every `C` instance will be allocated in heap and C(3)
will be destroyed on garbage collection.

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