On 05/03/14 01:05, Mark Isaacson via Digitalmars-d-learn wrote:
> 2) I ran into this issue while attempting to leverage the postblit for
> code-reuse. In particular, I have a setup that is similar to:
>
> struct A {
> this(B b) { /* Stuff */ }
> }
>
> struct B {
> }
>
> void foo(T)(T param) {
> auto a = A(param);
> /* Stuff */
> }
>
> unittest {
> foo(A()); //Fails
> foo(B()); //Succeeds
> }
>
> The notion being that A and B are 2 ways to represent the same thing, why not
> convert everything to the A format and proceed from there; I figured the
> compiler would optimize out the pointless copy when T == A. Alas, as shown in
> my unittest, foo fails to accept arguments of type A.
What actually fails is the initialization of 'a'.
Add another
this(A a) { /* Stuff */ }
constructor to the 'A' struct, and it will work.
And, yes, the missing cpctors are a language problem.
artur
