CHashArrayStringString - MetaTrader 5 Library - MT4/MT5 Resources

The include file contains a set of classes that demonstrate one of the methods of organizing row hash arrays using string keys.

Usage example:

 #include <hasharray.mqh> blank on startup ()
  {
  CHashArrayStringString Hash;
  Hash.Put( "k1" , "v1" );
  Hash.Put( "k2" , "v2" );

  hash[ "k3" ] = "v3" ;
  Hash[ "k2" ] = "vv2" ;

string t1 = hash[ "k1" ]. value;
string t2 = hash[ "k2" ]. value;
string t3 = hash[ "k3" ]. value;

Alert ( “k1=" ,t1);
Alert ( “k2=" ,t2);
Alert ( “k3=" ,t3);
  } 

Performance test:

The include file contains a set of classes that demonstrate one of the methods of organizing row hash arrays using string keys.

 #include <hasharray.mqh> blank on startup ()
{
  CHashArrayStringString Hash();
Unit start time = get tick number ();
for ( integer n= 0 ; n< 10000 ; n++)
  {
      Hash[ "key" + integer to string (n)] = "garbage" ;
  }
Total unit time = get tick number () - start time;
Alert ( "Add 10k elements in" , integer to string (total time), "Multiple Sclerosis" );
  
 }

 Add 10k elements in 31 milliseconds 

Attachment download

📎 test_chasharraystringstring.mq5 (1.16 KB)

📎 test_chasharrayperformance.mq5 (1.09 KB)

📎 hasharray.mqh (5.08 KB)

Source: MQL5 #7047