On Friday, 30 May 2014 at 12:35:46 UTC, francesco cattoglio wrote:
Today I got the following compile error:
"Cannot implicitly convert expression (<blabla>) of type
const(<Type>) to <Type>"
and this is a reduced example ( also on
http://dpaste.dzfl.pl/f2f3bd921989):
module test;
import std.stdio;
class Foo {
int i = 42;
}
class MyClass {
private { Foo _Q; }
this() {_Q = new Foo;}
Foo getQ () { return _Q; }
const (Foo) getQ () const { return _Q; } // OK
// const Foo getQ () const { return _Q; } // fails
}
void main() {
const MyClass instance = new MyClass;
writeln(instance.getQ.i);
}
I don't really understand what's going on here. Why is "const
Foo getQ()" wrong?
And why is "const(Foo) getQ" so much different? (e.g: this is
an explicit cast, right? Is there anything that might go wrong?)
Outcome of terrible decision to apply front `const` to
function/method type itself and not return type.
