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virtual operators c++ probelm

General and Gameplay Programming Programming

Started by masterbubu April 23, 2010 04:06 AM

2 comments, last by phresnel 14 years ago

masterbubu

181

Author

April 23, 2010 04:06 AM

[SOURCE]

class A
{
	public:
	A(){}
	~A(){}
	virtual operator const char*() const
	{
		return "A";
	}

};

class B : public  A
{
public:
	B(){}
	~B(){}

	  operator const char*() const
	 {
              return "B";
	 }
};

int main()
{
   B b;
   A* a = &b;
   const char* str = (const char*)a;
}

[/SOURCE]

I debug the code and none of the operators get called. (if "a" were not a pointer it works fine ). if you type:

[SOURCE]
const char* str = a->operator const char*(); // This works fine
[/SOURCE]

Why the first version did not worked? tnx,

CastorX

132

April 23, 2010 04:14 AM

This will work:

const char* str = (const char*)*a;

The problem with yours:
const char* str = (const char*)a;
is that you convert a pointer (to an object) to const char*, but you have to convert the object itself (the compiler will call the operator you wrote to do that).