Constant function/delegate literal

[Timon Gehr]

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;
> }
>
> ?
>
> 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