reading from file

[rikki cattermole via Digitalmars-d-learn]

On 14/12/2016 4:42 AM, Namal wrote:
> Hello, comming from C++, I find it hard to remember and understand how
> reading from file should be done in D. Especially since I am not very
> good in functional programming. So I have a file which looks like this:
>
> 1,2,3,4
> 5,6,7,8
> 9,11,11,12
>
> and so on
>
> How could I read it row by row and create an array accordingly without
> reading the comma?

import std.stdio : File;
import std.algorithm : splitter, count;
import std.conv : to;

foreach(line; File("myfile.csv", "r").byLine) {
	int[] linetemp;
	linetemp.length = line.count(",") + 1;

	size_t i;
	foreach(num; line.splitter(",")) {
		linetemp[i] = to!int(num);
		i++;
	}

	// ... = linetemp.dup;
}

This could be done a lot simpler especially with std.csv help for your 
case. But this should work with only one allocation per line.