Matrix creation quiz

[bearophile]

Pedro Rodrigues:

> The fact that 'i' and 'j' are deduced to type 'uint' in the second 
> version. That's the kind of bug that would keep me up at night.

Almost right answer. i and j are size_t, that is not uint in 64 bit compilations. Unsigned numbers cause the (i-j) sub-expression to give wrong results.

------------------------

Moritz Warning:

> I wonder, can there be done smth. on behalf of the language to prevent
> this kind of bug?

Two possible solutions, both refused by Walter:
- Dmd may use signed word for array indexes and lenghts.
- dmd may introduce runtime overflows.

Bye,
bearophile