segmentation fault

[poupik]

hi
i have a class with a member which is a pointer to an object on the heap.
(the object is created from outside the class and is passed to it as a reference in the constructor).

when i try to access it from void functions, everything is ok.

but when i try to access it from value returning functions, i get a segmentation fault.
(the functions are public members of the class)

is it something i'm missing, or is just impossible? (to access from value returning funcs..)

thanks

[PiMaster]

SEGFAULT is an error passed when you try to access memory outside of your programs memory, like creating a buffer and accessing an element with an index greater than or equal to its size. I don't think we'll be able to tell you what's going on without a little bit of code.

[poupik]

yeah, i figured..

class candidate{
private:
	...
        int id;
        myClock *clock;
	...

public:
	candidate (int _id, myClock &_clock ); //constructor
	int getID();
	void waiting();
};

candidate::candidate
		(int _id, myClock &_clock)
{
	id = _id;
	clock = &_clock;
	
}

int candidate::getID(){
	(*clock).some_method();  // <=this generates segfault
        return id;
}


void candidate::waiting(){
	 (*clock).some_method(); // <===== this doesnt
	
}

i dont understand why the myClock object is not visible from the getID() method.

[poupik]

anything?

[h9uest]

You didn't get PiMaster's post.
Typically, it has nothing to do with value-returning or void function, that's not the main point, at least.
Trying locating the exact place that generates segfault by inserting cout statements, and pay special attention to:
1. whether an object still exists in memory before you access it
2. have you accessed something outside the boundaries (array, vector, etc)