Initial Commit.

2026-06-23 21:47:51 +08:00
commit d17f68e979
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+# ArrayIsDynamic
+
+The function checks whether an array is dynamic.
+
+```
+bool  ArrayIsDynamic(
+   const void&  array[]    // checked array
+   );
+
+```
+
+Parameters
+
+array[]
+
+[in]  Checked array.
+
+Return Value
+
+It returns true if the selected array is [dynamic](/en/docs/basis/types/dynamic_array), otherwise it returns false.
+
+Example:
+
+```
+#property description "This indicator does not calculate values. It makes a single attempt to"
+#property description "apply the call of ArrayFree() function to three arrays: dynamic one, static one and"
+#property description "an indicator buffer. Results are shown in Experts journal."
+//--- indicator settings
+#property indicator_chart_window
+#property indicator_buffers 1
+#property indicator_plots   1
+//--- global variables
+double ExtDynamic[];   // dynamic array
+double ExtStatic[100]; // static array
+bool   ExtFlag=true;   // flag
+double ExtBuff[];      // indicator buffer
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function                         |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+//--- allocate memory for the array
+   ArrayResize(ExtDynamic,100);
+//--- indicator buffers mapping
+   SetIndexBuffer(0,ExtBuff);
+   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0);
+//---
+   return(INIT_SUCCEEDED);
+  }
+//+------------------------------------------------------------------+
+//| Custom indicator iteration function                              |
+//+------------------------------------------------------------------+
+int OnCalculate(const int rates_total,
+                const int prev_calculated,
+                const int begin,
+                const double &price[])
+  {
+//--- perform a single analysis
+   if(ExtFlag)
+     {
+      //--- attempt to free memory for arrays
+      //--- 1. Dynamic array
+      Print("+============================+");
+      Print("1. Check dynamic array:");
+      Print("Size before memory is freed = ",ArraySize(ExtDynamic));
+      Print("Is this a dynamic array = ",ArrayIsDynamic(ExtDynamic) ? "Yes" : "No");
+      //--- attempt to free array memory
+      ArrayFree(ExtDynamic);
+      Print("Size after memory is freed = ",ArraySize(ExtDynamic));
+      //--- 2. Static array
+      Print("2. Check static array:");
+      Print("Size before memory is freed = ",ArraySize(ExtStatic));
+      Print("Is this a dynamic array = ",ArrayIsDynamic(ExtStatic) ? "Yes" : "No");
+      //--- attempt to free array memory
+      ArrayFree(ExtStatic);
+      Print("Size after memory is freed = ",ArraySize(ExtStatic));
+      //--- 3. Indicator buffer
+      Print("3. Check indicator buffer:");
+      Print("Size before memory is freed = ",ArraySize(ExtBuff));
+      Print("Is this a dynamic array = ",ArrayIsDynamic(ExtBuff) ? "Yes" : "No");
+      //--- attempt to free array memory
+      ArrayFree(ExtBuff);
+      Print("Size after memory is freed = ",ArraySize(ExtBuff));
+      //--- change the flag value
+      ExtFlag=false;
+     }
+//--- return value of prev_calculated for next call
+   return(rates_total);
+  }
+
+```
+
+See also
+
+[Access to timeseries and indicators](/en/docs/series)