On Tuesday, 15 May 2012 at 16:03:16 UTC, Matt Soucy wrote:
I'm trying to learn D, by playing with code and reading this
forum. I'm
a slow learner. :)
Anyways, I looked at std.stdio code and noticed that byLine
resturns a
struct ByLine, but where does the .map come from? Thanks!
It comes from std.algorithm. What that line does is:
f.byLine() // Get by lines, exactly as you know already
.map!"a.idup"() // Iterate over the byLine, and make a Range of
immutable strings with the same contents as each line.
.array() // Convert it from a range to an array of strings
This is achieved through templates accepting strings at compile
time to be somewhat like lambda functions, and UFCS.
Okay thanks alot Matt and Ali, that helps alot, but I still don't
get the dot in ".map" from the line above. Doesn't the dot mean
that .map is a member or a member function of the return value of
byLine()? Which, in this case is struct ByLine?
thanks.
