I have a few [newcomer] questions about Tuples that I hope are easy to answer. What I am trying to create is a property that accepts any tuple:

template Tuple( E... ) {
    alias E Tuple;
}

class Foo {
    int bar( E... )( E e ) {
        ...
    }
}

Foo f = new Foo();
f.bar( 1, 2 );              // Works properly
f.bar( Tuple!( 1, 2 ) ); // Works properly
f.bar = Tuple!( 1, 2 ); // Error: Error: (f).bar(E...) has no value

Is this intended? How can I wrap up the Tuple into a single object so it will pass off as a property?

Changing 'bar' to 'opAssign' yields a different result for the third example. Instead of printing out an error I get an alert "abnormal program termination."

Also, is there, or will there ever be a bracket sequence for initializing Tuples? Tuple!( a, b, c, ... ) into something like ![ a, b, c, ... ]?

Thanks,
Brian Byrne

Reply to Brian,

> I have a few [newcomer] questions about Tuples that I hope are easy to
> answer. What I am trying to create is a property that accepts any
> tuple:
> 
> template Tuple( E... ) {
> alias E Tuple;
> }
> class Foo {
> int bar( E... )( E e ) {
> ...
> }
> }
> Foo f = new Foo();
> f.bar( 1, 2 );              // Works properly
> f.bar( Tuple!( 1, 2 ) ); // Works properly
> f.bar = Tuple!( 1, 2 ); // Error: Error: (f).bar(E...) has no value
> Is this intended? How can I wrap up the Tuple into a single object so
> it will pass off as a property?
> 
> Changing 'bar' to 'opAssign' yields a different result for the third
> example. Instead of printing out an error I get an alert "abnormal
> program termination."
> 
> Also, is there, or will there ever be a bracket sequence for
> initializing Tuples? Tuple!( a, b, c, ... ) into something like ![ a,
> b, c, ... ]?
> 
> Thanks,
> Brian Byrne

For one thing, I'm not sure that any of those should work. Template members are invalid last time I checked.

BCS wrote:
> Reply to Brian,
> 
>> I have a few [newcomer] questions about Tuples that I hope are easy to
>> answer. What I am trying to create is a property that accepts any
>> tuple:
>>
>> template Tuple( E... ) {
>> alias E Tuple;
>> }
>> class Foo {
>> int bar( E... )( E e ) {
>> ...
>> }
>> }
>> Foo f = new Foo();
>> f.bar( 1, 2 );              // Works properly
>> f.bar( Tuple!( 1, 2 ) ); // Works properly
>> f.bar = Tuple!( 1, 2 ); // Error: Error: (f).bar(E...) has no value
>> Is this intended? How can I wrap up the Tuple into a single object so
>> it will pass off as a property?
>>
>> Changing 'bar' to 'opAssign' yields a different result for the third
>> example. Instead of printing out an error I get an alert "abnormal
>> program termination."
>>
>> Also, is there, or will there ever be a bracket sequence for
>> initializing Tuples? Tuple!( a, b, c, ... ) into something like ![ a,
>> b, c, ... ]?
>>
>> Thanks,
>> Brian Byrne
> 
> For one thing, I'm not sure that any of those should work. Template members are invalid last time I checked.
> 
> 

Template member functions work (and have for some time), they're just implicitly final.

-- 
Kirk McDonald
Pyd: Wrapping Python with D
http://pyd.dsource.org