On 03/15/2015 08:47 AM, "Marc =?UTF-8?B?U2Now7x0eiI=?=
<schue...@gmx.net>" wrote:
> Should this work?
>
> struct V(string s) {
> }
>
> struct S(int U) {
> V!"xyz" x;
> alias x this;
> }
>
> void main() {
> S!10 a;
> static assert(is(a : V!Args, Args...));
> }
>
> With DMD Git master, the static assert() fails. Should it? Am I doing
> something wrong? How can I test whether something is implicitly
> convertible to any instance of a particular template?
There is no way other than checking for compile-time duck typing (see
the implementations of isInputRange and others).
One reason is that the compiler does not have the concept of "an
instance of a template". Templates are for code generation and only the
end-result (i.e. S!10) lives as a concept when compiling.
Ali
