use of STL has problems

[digituner]

I defined axFx class like this :

class axFx : public Object
{
private:
	int ef_index;
	char* ef_filename;
	int noframes;
	int ident;
public:
	axFx();
 	void SetNofFrame(int p) { noframes = p; }
 	int GetNofFrames() { return noframes; }
	void SetFilename(char* filename);
	char* GetFilename() { return ef_filename; }
	int GetIndex() { return ef_index; }
	int GetIdent() { return ident; }
	void SetIdent(int p) { ident = p; }
	//void SetOrder(int* p) {};
	void SetIndex(int p) { ef_index = p; }
};

and this code has some problems

                axFx* fx = new axFx();
                ... // define instance "fx"
		fx_col.push_front(*fx);
               delete fx;

the problem is on about list container class defined by "list<axFx> fx_col;" (it's a member of some class)

I pushed "fx" from front, but "fx_col" doesn't accept this. still "fx_list._S ize" is gain one. but "fx_list.begin( )" (it's expample for first element of list.) has all member vars with -842150451or 0xcdcdcdcd.

what does it means? plz help some advices ;(

[AdrianH]

You are stating that fx_col is a list<axFx>, but axFx doesn’t define a copy constructor, so it would create a member-wise copy. This is more than a little dangerous as you have a pointer in axFx.

That not withstanding, I’m not sure what you mean by “I pushed "fx" from front, but "fx_col" doesn't accept this.” Do you get a compilation error? How do you know it is not being accepted?


Adrian

[digituner]

I solved this problem now. (it's because I dunno about STL.)
I used context viewer in vc++ 6 for watch memory status.
and I saw _Head has stupid offset and values. but I misunderstood the offset what fx_list.begin() returns. finally, _Head is does not seem to be outside users... of course.
thx for your answer.

[AdrianH]

Good that you figured it out. Enjoy your victory.


Adrian