[Issue 6365] AutoTupleDeclaration

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http://d.puremagic.com/issues/show_bug.cgi?id=6365



--- Comment #31 from bearophile_hugs at eml.cc 2011-08-18 23:47:46 PDT ---
Regarding this change, removing tuple unpacking for arrays is not a good idea,
in my opinion. You are making tuples less handy, with zero gain in doing so.

https://github.com/9rnsr/dmd/commit/6fa008162fe29a1459c35dccb9e08009598206d0

Conceptually it's the same thing as doing:

void main() {
    int[] a = [1, 2];
    int[2] b = a;
}

The compiler will need to verify at runtime that a has length 2. Given this
precedent in the language, there is no point in forbidding a similar operation
on tuples:

void main() {
    int[] a1 = [1, 2];
    auto (x, y) = a1;
    int[2] a2 = [1, 2];
    auto (z, w) = a2; // no need to verify a2 length at runtime here
}


I think this is what Walter was talking about in comment 26:

>I think any expansion of tuple support should be part of a more comprehensive design for tuples.<


Python tuples support this operation, that feels natural enough to Python
programmers:

>>> a1 = [1, 2]
>>> (x, y) = a1
>>> x
1
>>> y
2

So in my opinion Andrei is wrong here.

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