On 7/1/15 5:09 AM, aki wrote:
Following code causes run-time error.
How can I use static this() without causing error?
It's difficult to avoid this situation because
actual code is more complex.
file main.d:
void main() {
}
file a.d:
import b;
class A {
static this() {}
};
file b.d:
import a;
class B {
static this() {}
};
object.Exception@src\rt\minfo.d(162): Aborting: Cycle detected between
modules with ctors/dtors:
a -> b -> a
You need to either factor out the static constructors to put them in a
leaf module, replace one of them with intializers, or remove one of them.
It can be an exercise in ugly coding, but you can fix this.
I know it wasn't specifically asked, but the reason it exists is simple:
class A {
static int x;
static this() { x = B.x + 5;}
}
...
class B {
static int x;
static this() { x = A.x + 5;}
}
The runtime cannot introspect the code to detect the circular
dependency, so it makes a conservative decision. I'm waiting on an
introduction of RTInfo for modules [1] to allow us to mark static ctors
as standalone, then we can probably fix this problem through a sort of
"trust the programmer" mechanism.
-Steve
[1] https://issues.dlang.org/show_bug.cgi?id=10023
