On Wednesday, 9 August 2017 at 13:36:46 UTC, Steven Schveighoffer wrote:
On 8/8/17 3:43 PM, Anonymouse wrote:
On Tuesday, 8 August 2017 at 16:00:17 UTC, Steven Schveighoffer wrote:
I wouldn't use formattedRead, as I think this is going to allocate temporaries for a and b.

What would you suggest to use in its stead? My use-case is similar to the OP's in that I have a string of tokens that I want split into variables.

using splitter(","), and then parsing each field using appropriate function (e.g. to!)

For example, the OP's code, I would do:

auto r = line.splitter(",");
a = r.front;
b = r.front;
c = r.front.to!int;

It would be nice if formattedRead didn't use appender, and instead sliced, but I'm not sure it can be fixed.

Note, one could make a template that does this automatically in one line.


The blog post Steve referred to has examples of this type processing while iterating over lines in a file. A couple different ways to access the elements are shown. AA access is addressed also: https://dlang.org/blog/2017/05/24/faster-command-line-tools-in-d/


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