On 15/01/12 20:35, Timon Gehr wrote:
On 01/14/2012 07:13 PM, Vladimir Matveev wrote:
Hi,
Is there a reason why I cannot compile the following code:
module test;
struct Test {
int delegate(int) f;
}
Test s = Test((int x) { return x + 1; });
void main(string[] args) {
return;
}
dmd 2.057 says:
test.d(7): Error: non-constant expression cast(int
delegate(int))delegate pure
nothrow @safe int(int x)
{
return x + 1;
}
?
The 'this' pointer in the delegate:
Test((int x) { return x + 1; });
is a pointer to the struct literal, which isn't constant. You actually
want it to point to variable s.
OTOH if it were a function, it should work, but it currently doesn't.
This is simple example; what I want to do is to create a global variable
containing a structure with some ad-hoc defined functions. The compiler
complains that it "cannot evaluate .... at compile time". I think this
could
be solved by defining a function returning needed structure, but I
think this
is cumbersome and inconvenient.
Best regards,
Vladimir Matveev.
I think it should work. I have filed a bug report:
http://d.puremagic.com/issues/show_bug.cgi?id=7298
