On 04/30/2012 05:45 AM, H. S. Teoh wrote:
On Sun, Apr 29, 2012 at 04:40:37PM +0200, Jacob Carlborg wrote:
[...]
So really, what is needed is a sane looping construct that unifies while
loops, do-loops, and exit-in-the-middle loops. Something like this:
loop {
// first part of loop body
} exitWhen(!loopCondition) {
// second part of loop body
}
It doesn't have to be this exact syntax, but the point is that you need
to be able to express loop exits from the middle of a loop body without
needing to resort to for(;;) and break, when the loop is a good ole
simple loop with a single entry point and a single exit point. (More
complex loops that need continue's and break's are, well, more complex,
so it's OK to sprinkle if conditions in them like we do now.)
</rant>
do{
// ...
}while(cond){
// ...
}
I think the scoping rules of the do-while loop should be fixed such that
the loop condition can refer to loop-local variables. Violates C
backwards compatibility though...
[...]
* Infix notation for calling any method taking one argument
* Basically any symbol is allowed in method names
That is:
1 + 2
foo bar foo_bar
Would be translated to:
1.+(2)
foo.bar(foo_bar)
That is a very general way to handle operators and let the user
create new operators, not just overloading existing ones.
[...]
While personally, I like the idea of being able to create new infix
operators, it will cause too big a change to D syntax, and probably
cause lots of breakages with existing code, as well as make the
lexer/parser much harder to implement (given the existing D features).
Should be trivial. (The parser can just defer operator precedence
resolution to the analysis phase if necessary, and otherwise it is very
simple anyway.)
You also then have to deal with operator precedence between arbitrary
user-defined operators, which is non-trivial in general (though it's
workable if you impose some constrains
I kinda like the Scala-approach.
-- but it's probably way beyond the scope of D2 or even D3).
An issue is that it clashes with eg. a+***ptrtoptrtoptrtodata.
