C++ Pointer to Class

Question

I have a problem for calling the method of library "gum" in my program:

gum::BayesNet<double> *myBayNet=new gum::BayesNet<double>;
gum::DiscrereVariable* DV=new gum::DiscretizedVariable<double>;
int main()
{
  // error: invalid declaration
  // of 'gum::BayesNet<duoble>::add' & //forbids declaration of 'DV' 
  unsigned int gum::BayesNet<duoble>::add(const (*DV) str) 
  {
    return (*myBayNet).add(str);
  }
}

(See error message in comment.)

I REALLY hope that the error is not the double misspelled... it's DOUBLE, not DUOBLE — Castilho, Apr 08 '12 at 18:48
the arguments (inputs) of add (const (*DV) str) is a class in DiscrereVariable. how can I define these inputs? — Shahram Khazaie, Apr 08 '12 at 18:52
You urgently need a (better) [C++ book](http://stackoverflow.com/questions/388242/), Shahram. That code is awful — and I'm not referring to the syntax error of defining a member function in `main()`. Why are you using globals? Why are you allocating them dynamically? — sbi, Apr 08 '12 at 18:54
gum::DiscreteVariable* DV=new gum::DiscreteVariable; template gum::BayNet *myBayNet=new gum::BayNet; unsigned int template gum::BayNet::add(const (*DV)) {int str;return (*myBayNet).add(str);} — Shahram Khazaie, Apr 08 '12 at 19:06
gum::DiscreteVariable* DV=new gum::DiscreteVariable;template gum::BayNet *myBayNet=new gum::BayNet; unsigned int template gum::BayNet::add(const (*DV)) {int str;return (*myBayNet).add(str);} — Shahram Khazaie, Apr 08 '12 at 19:14
can not allocate an object of abstract type gum::DiscreteVariable because des following virtual function are pure within DiscreteVariable...gum::DiscreteVariable::DoamneSize() — Shahram Khazaie, Apr 08 '12 at 19:16

Hauleth · Answer 1 · 2012-06-07T10:59:19.063

2

DAFUQ is that const (*DV) str? DV is a variable and you are trying to use it as a typename. Also instead of writing (*myBayNet).add(str) simpler (and shorter) way is to write myBayNet->add(str).

edited Jun 07 '12 at 10:59

answered Apr 08 '12 at 18:50

Hauleth

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score 1 · Answer 2 · answered Apr 08 '12 at 18:49

1

You are not calling a method, your are defining it. However, you must not define member functions within main() or any other function scope. They must be defined at namespace scope.

answered Apr 08 '12 at 18:49

sbi

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C++ Pointer to Class

2 Answers2