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