Neal Gafter wrote:
> I like this. The exception tables presumably would be allowed to contain
> entries for subtypes of Jump.
And if possible, optimized to only be interested in jumps generated
immediately within the interesting scope, to filter out jumps generated
at deeper scopes not directly of interest.
/** runs the given closure five times for each element */
public void fiveForEach(Closure c) {
int elementIndex = 0;
while (elementIndex < size) {
int loopCount = 0;
loop { // loop takes a closure
if (loopCount >= 5) break; // return ends the inner loop
c.call(getElement(elementIndex));
loopCount++;
}
elementCount++;
}
}
...
public Object weirdFind() {
x = createSomeList();
x.fiveForEach {(Object o) if (someTest(o)) return o; }
}
Here, the run method is only interested in a ReturnJump, and more
specifically, it's only interested in the ReturnJump that would be
generated within the closure passed to fiveForEach. The loop inside
fiveForEach is only interested in the BreakJump generated inside the
loop. However, because the ReturnJump is generated by a call to that
closure inside the loop, it will pass through the loop's
jump/exception-handling table. Rather than have all closure-accepting
methods catch and filter all jumps, it would be preferable that they
only catch the ones they could reasonably respond to.
Of course, it should still be possible for someone to write code that
explicitly catches Jump, to avoid a rogue (i.e. badly compiled?) jump
event from blowing the whole stack. This could also be a recommended
documentation practice:
will capture any return or break jumps passing through it:
/**
* ...
* @jumps ReturnJump, BreakJump
*/
...
will capture all jumps; don't expect jumps passing through this to escape
/**
* ...
* @jumps *
Unnecessary perhaps?
- Charlie
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