Call a function dynamically

New comment
 

Hi,

do you know if it's possible to call a function dynamically please? I f yes, how?

Example:

Function declaration:

Void myFunction1(){...;...;...;}

Void myFunction2(){...;...;...;}

Void myFunction3(){...;...;...;}

In the code:

for(i=1;i<4;i++)
{
  myFunction+"i()";

}
This example doens't work, but it's the idea I would want to do.


Thanks!!

 

Yes and no.

It's possible with pointer to function, but you need to have the same function signature.

 
Patrick Chalindar:

Hi,

do you know if it's possible to call a function dynamically please? I f yes, how?

Example:

Function declaration:

Void myFunction1(){...;...;...;}

Void myFunction2(){...;...;...;}

Void myFunction3(){...;...;...;}

In the code:

for(i=1;i<4;i++)
{
  myFunction+"i()";

}
This example doens't work, but it's the idea I would want to do.


Thanks!!

No you can not. I wished this feature too but it exists only in PHP.
 
  1. When you post code please use the CODE button (Alt-S)! (For large amounts of code, attach it.) Please edit your post.
              General rules and best pratices of the Forum. - General - MQL5 programming forum
              Messages Editor

  2. There is no such thing, but you can make one.
    void myFunction1(){...;...;...;}

void myFunction2(){...;...;...;}

void myFunction3(){...;...;...;}

void myFunction(int i){
   switch(i){
   case 1: myFunction1(); break;
   case 2: myFunction2(); break;
   case 3: myFunction3(); break;
   default: PrintFormat(__FUNCTION__" called with %i",i);
   }; // switch
}

for(i=1;i<4;i++){
  myFunction(i);
}

 

Patrick Chalindar:

Hi,

do you know if it's possible to call a function dynamically please? I f yes, how?

As @Alain Verleyen said if you have the same function signature it is possible. You can use pointers to function or you can use classes. See an example:

class cParent
  {
public:
   virtual double math(const double a,const double b) {return(0.0);}
  };
class cAdd:public cParent
  {
   virtual double math(const double a,const double b) {return(a+b);}
  };
class cMultiple:public cParent
  {
   virtual double math(const double a,const double b) {return(a*b);}
  };

void OnStart()
  {
   cParent *math[2];
   math[0]=new cAdd();
   math[1]=new cMultiple();
   double a=3.0,b=5.0;
   printf("Addition: %.2f ; Multiplication: %.2f",math[0].math(a,b),math[1].math(a,b));
   // Result: Addition: 8.00 ; Multiplication: 15.00
   delete math[0];
   delete math[1];
  }
 

Thanks for your answers,

structure and classes are somethings about that I had thought, it's helpfull but not exactly that I want to do.

New comment