On Friday, August 23, 2013 23:28:46 Matej Nanut wrote:
> Hello!
>
> I've run into this issue that I don't understand, maybe someone
> can enlighten me. :)
>
> This code:
> ---
> struct Thing
> {
> int i;
> }
>
> void main()
> {
> t!(Thing.i)();
> }
>
> void t(alias a)()
> {
> return;
> }
> ---
>
> fails to compile with: ‘Error: need 'this' for 't' of type 'pure
> nothrow @safe void()'’.
>
> If I declare ‘t’ as static, it works (and does what I want it to
> do).
Because without static it's a member variable, which means that you have to
have a constructed object to access it (since it's part of the object). When
you declare a variable in a class or struct static, then there's only one for
the entire class or struct, so it can be accessed without an object. And when
you do StructName.var or ClassName.var your accessing the variable via the
struct or class rather than an object, so the variable must be static.
- Jonathan M Davis
