Don Clugston:
* Do-while loops, how useful are those actually?
I grepped through the DMD source once, looking for how often
Walter uses do..while. The answer: exactly zero.
In my code I use one do-while about every 20 or 30 loops, so they
aren't very common, but are useful.
If I need a random 2D point on a disk, one method to produce it
is by rejection, I use a do-while loop, I extract two coordinates
in a square, and then test if they are inside the disk, otherwise
I loop.
But I have a problem with D-style do-while loops, that some time
ago I have discussed a bit in D.learn: I can't use them like
this, because the variables defined inside the loop are not
visible in the loop test:
do {
// ...
const x = compute something
} while (predicate(x));
I have to use this, that is less handy:
T x;
do {
// ...
x = compute something
} while (predicate(x));
Bye,
bearophile
