On Friday, 29 January 2016 at 17:44:34 UTC, Chris Wright wrote:
I want to create an opApply for a type.
I've marked my code @safe, because everything I wrote was
@safe. The body of opApply is @safe, but it calls a delegate
that may or may not be @safe.
How do I make it so I can iterate through this type safely and
systemly?
I want to support iteration like:
foreach (string key, string value; collection) {}
foreach (size_t i, string key, string value; collection) {}
You can implement an input range and annotate all the primitives
as @safe.
Then if there's only an input range in your agregate, DMD will
auto-detect that it must use it in foreach():
http://dlang.org/spec/statement.html#foreach-with-ranges
in the worst case (range not implementable directly but only as a
getter in .range() or .opSlice() you'll have to change the style
a bit and consume the range explicitly in a typical "while
(!stuff.empty) {...}"
