Are Tuples as lvalues supposed to be supported?

[BCS]

Reply to Russell,

> I thought that I was supposed to be able to use a Tuple as an lvalue
> in a struct, such as:
> 
> struct Encapsulate(U...) { U val; }
> 
> void Foo(U...)(U args) {
> Encapsulate!(U) temp;
> temp.val = args;
> }
> However, when I instantiate Foo, I get the error:
> Error: temp.val is not an lvalue.
> So, I looked on the website, and didn't find a statement that I could
> do this.  So I'm asking: is this a 2.0 feature, or is the lack of it a
> bug?
> 
> Russ
> 
> P.S. The lack of this is going to make it rather annoying to build a
> Curry() template which takes multiple arguments.  I will have to
> either implement many different Curry templates with different numbers
> of arguments, or else nest them...
> 


Do it one part at a time (note that the foreach is unrolled at compile time).

struct Encapsulate(U...) { U val; }

void Foo(U...)(U args) {
Encapsulate!(U) temp;
foreach(int i,_;U)
temp.val[i] = args[i];
}


BTW if you just need a curry template I have a compile time one you might 
like:

http://www.dsource.org/projects/scrapple/browser/trunk/arg_bind/bind.d

If you need run time currying I might be able to hack that over lunch.