automate tuple creation

[forkit]

On Friday, 21 January 2022 at 03:57:01 UTC, H. S. Teoh wrote:
>
> std.array.appender is your friend.
>
> T

:-)

// --

void ProcessRecords
(in int[][int][] recArray, const(string) fname)
{
     auto file = File(fname, "w");
     scope(exit) file.close;

     Appender!string bigString = appender!string;
     bigString.reserve(recArray.length);
     debug { writefln("bigString.capacity is %s", 
bigString.capacity); }

     void processRecord(const(int) id, const(int)[] values)
     {
         bigString ~= id.to!string ~ values.format!"%(%s,%)" ~ 
"\n";
     }

     foreach(ref const record; recArray)
     {
         foreach (ref rp; record.byPair)
         {
             processRecord(rp.expand);
         }
     }

     file.write(bigString[]);
}

// ---