Re: Can you read the next line while iterating over byLine?

[Jack Stouffer via Digitalmars-d-learn]

On Thursday, 2 February 2017 at 18:18:13 UTC, John Doe wrote:
Let's say you're trying to parse a file format like:
Name
http://example.com
123234

Foo Bar
http://dlang.org
888888

with blocks separated by varying amount of blank lines.

-----
import std.stdio;

void main(string[] args){
    auto range = File("text.txt").byLine();

    foreach( line; range ){
        if (line != ""){
            writeln(line);
            // char[] url = range.???
            // char[] num = range.???
        }
    }
}
-----
How can you read the next line while iterating over a file line 
by line, so that the next iteration uses the line after next? 
If this isn't possible byLine is a design flaw and D should 
instead provide a regular readLine function.

btw: What is this? A forum for a programming language that 
doesn't support code blocks?

If you understand the underlying range interface, the answer 
becomes clear:


import std.stdio;

void main(string[] args)
{
    auto range = File("text.txt").byLineCopy();

    foreach (line; range)
    {
        if (line != "")
        {
            writeln(line);
            range.popFront;
            char[] url = range.front();
            range.popFront;
            char[] num = range.front();
        }
    }
}