On Tue, Nov 06, 2012 at 04:20:34PM +0100, Joseph Rushton Wakeling wrote:
> Suppose that I have two struct templates which take identical
> parameter lists:
>
> struct Foo(T1, T2, T3)
> {
> ...
> }
>
> struct Bar(T1, T2, T3)
> {
> ...
> }
>
> Now suppose that I have a Foo which has been instantiated with a
> given set of parameters. Is there any way for me to say, "now
> instantiate a Bar with the same parameters?"
You could alias the parameters so that they're accessible from outside:
struct Foo(T1, T2, T3)
{
alias T1 t1;
alias T2 t2;
alias T3 t3;
...
}
struct Bar(X1, X2)
{
...
}
auto fooToBar(FooInstance)(FooInstance f)
{
return Bar!(f.t2, f.t3)();
}
This works if T1, T2, T3 are types. If they're values, you'll need to
use enums in Foo instead.
T
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who can't.
