automate tuple creation

[forkit]

On Friday, 21 January 2022 at 08:53:26 UTC, Stanislav Blinov 
wrote:
>

turns out the problem has nothing to do with appender...

It's actually this line:

if (!idArray.canFind(x)):

when i comment this out in the function below, the program does 
what I want in seconds.

only problem is, the ids are no longer unique (in the file)

// ---
void createUniqueIDArray
(ref int[] idArray, const(int) recordsNeeded)
{
     idArray.reserve(recordsNeeded);
     debug { writefln("idArray.capacity is %s", idArray.capacity); 
}

     int i = 0;
     int x;
     while(i != recordsNeeded)
     {
        // id needs to be 9 digits, and needs to start with 999
        x = uniform(999*10^^6, 10^^9); // thanks Stanislav

        // ensure every id added is unique.
        //if (!idArray.canFind(x))
        //{
            idArray ~= x; // NOTE: does NOT appear to register 
with -profile=gc
            i++;
        //}
     }

     debug { writefln("idArray.length = %s", idArray.length); }
}

// ----