CIndicator inheritence and casting question and a bug

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Hi

I can't get it right when using the CIndicator and the inherited classes.

If I declare a CIndicator pointer, and then use it as an inherited CiCustom, I can't manage to make it.

CIndicator    *ind;

Ind = new CiCustom; 

and when using a method from CiCustom, NumBuffers, in order to set the number of the buffers I get error message: 'NumBuffers' - wrong parameter count.

Ind.NumBuffers(1)   ==> wrong parameter count

because probably NumBuffers of the CiCustom that sets the buffers is not recognised. What am I doing wrong? 

and also then when I try to inspect the Ind variable in order to see what type of CIndicator inherit is it (CiCustom or others)

how do I do it? Because I can't get it with:

switch (Ind.Type())

   case IND_CUSTOM:

       ....

because Type() is not declared in the CIndicator, only in it's inheritors.

The reason that I need to know at run time the type of the indicator, is that if it is custom indicator I want to be able to get the Indicator parameters thru the methods in CiCustom. 

BUG ** - the initialize method in CiCustom does not initializes m_num_params 

thank you 

 

buitiful!!!

 
 

also with casting to CiCustom I couldn't manage:

(CiCustom)Ind.NumBuffers(1)  ==> wrong parameter count

 

Any comment from the team?

 

Thanks 

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It would be better, if you attach the code. It seems, that it contains an error. For more information see Virtual Functions help topic and the MQL for "Dummies": How to Design and Construct Object Classes article

 
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This is the code inside a script

CIndicator    *ind; 

ind = new CiCustom;

ind.NumBuffers(1);    // <== compiler error: wrong parameter count - I also tried ==> ((CiCustom)ind).NumBuffers(1);         // <=== invalid cust operation

if(ind.Create(NULL,PERIOD_CURRENT,IND_CUSTOM,8,parms)){
      Print("successful ind creation");
      }
   else
      Print("failed ind creation"); 

and then passing the ind pointer on to a different class and in that class:

CIndicator *ind;

switch (ind.Type()){               === > compiler error: type is not declared for CIndicator as virtual

   case IND_CUSTOM: 

         parms = ind.NumParams();      ====> always zero -> m_num_params inside CiCustom is zero, it was not initialized by the Initialize method of CiCustom 

} 

 

the ind.Create in third line, runs the Initialize method of CiCustom in the background but the method does not initializes the m_num_params, so on the other class when I use the method ind.NumParams() and get zero, even though the ind.Create was successful and the Initialize method ran.

P.S: 

Please look inside the code of the CiCustom.mqh and you will notice that there is no initialization of m_num_params anywhere in the code. 

And so, the method NumParams() that is defined:  int               NumParams()  { return(m_num_params); }               // <============= always return zero 

 

Anyone? Rosh?

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