Re: How to walk over two arrays by ref in beautyfull way?

[vitalfadeev via Digitalmars-d-learn]

On Monday, 10 June 2019 at 07:45:42 UTC, vitalfadeev wrote:

On Monday, 10 June 2019 at 07:41:40 UTC, vitalfadeev wrote:

How to?

I plan scan First array with checkers:
[checker, checker, checker]

...and store result to Second array:
[0, 0, 1]

In next code 'r' not reference. But expected ref.

    import std.range : zip;

    foreach(checker, ref r; zip(checkers, result.set)) {
       r = checker();
    }

What is the best way for speed and beautyfull D code?

Detailed:

import std.range : zip;
import std.stdio : writeln, write;


struct Result {
    byte[] set;
}

alias Callback = bool function();


Callback[] checkers;
Result result;


bool false_cb() { return 0; }
bool true_cb() { return 1; }


void init() {
        checkers ~= &false_cb;
        checkers ~= &false_cb;
        checkers ~= &true_cb;

        result.set.length = checkers.length;
}


void check() {
    foreach(checker, ref r; zip(checkers, result.set)) {
        r = checker();
    }
}


void print() {
    foreach(r; result.set) {
        write(r, " ");
    }
    writeln();
}


void main() {
    init();
    check();
    print();
}



https://run.dlang.io/is/Plqcq5