As agreed on in this week's meething, I removed compiler support for
iter functions and for-each loops today. Instead, it is now possible
to say
uint::range(0u, 10u) {|i|
log_err i;
}
my_map.items {|key, val|
...
}
If an call expression in statement position is followed directly by a
block ({| or {||), that block is added as a final argument to the
call. For a non-call expression, the expression becomes a call with a
single argument, the block.
(The reason it only recognizes expressions in statement position---at
the top level of an outer block---is that this way, you don't need to
terminate a block call with a semicolon. When using higher-order
functions in a way that returns a value, you'll have to put the block
inside the parentheses as before.)
Iterators are now simply functions that take a block as their last
argument. They are strictly as powerful as our old iterators, and
require much less compiler machinery.
An open problem is whether we want to allow break/continue or even
returning from the outer function inside a block. (This didn't work
for the old iterators either.)
Best,
Marijn
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