Re: Problem in calling an overloaded operator= from inside another
overloaded operator=
On 8/12/2011 8:24 AM, Afshin wrote:
I am developing code for a scheduling problem in which I have a class
for products (called cProduct) which contains, among others, an array
of class cResource to represent the resources used to process the
product. For both classes (cProduct and cResource), I have defined
overloaded operator= ; with operator= for cResource being called from
inside the overloaded operator= defined for cProduct. The problem is
that in calling the internal operator= (from inside the opertor= for
class cProduct) the value of rhs (being passed from internal call to
operator=) seems to get lost!. I appreciate any hint or clue on how to
fix this problem. Below is a summary of relevant classes and
overloaded operator=:
class cResource{
public:
cResource(); //constructor
int x; //as a sample member variable
.
cResource& operator= (const cResource& rhs);
.
};
cResource& cResource::operator= (const cResource& rhs){
.
x = rhs.x;
.
return *this;
}
class cProduct{
public:
cProduct(int ResNum);
int y; // as a sample member variable
int TotalRes;
.
cResource *Resource; //the array of resources to process the
product
.
cProduct& operator= (const cProduct& rhs);
};
cProduct& cProduct::operator= (const cProduct& rhs){
y = rhs.y;
for (int j=0; j<TotalRes; j++)
Resource[j] = rhs.Resource[j]; // HERE IS WHERE THE
PROBLEM OCCURS.
//The overloaded operator= for
Resource passes an 'undefined value' for rhs
.
return *this;
}
Thanks in advance for your comments and suggestions!
First suggestion: get yourself some patience (ask the neighbor or a
friend, they might have some to spare). Three identical posts within
half an hour is not a good sign.
Second suggestion: read about "the Rule of Three". Apparently you're
trying to manage dynamic memory in your 'cProduct' class and failing to
do so correctly. The problem is *not* in your 'cProduct::operator=',
the problem is *not* in your 'cResource::operator='. It's somewhere
else. The 'cProduct' that arrives into 'cProduct::operator=' is already
screwed up by some earlier action (or inaction). You need to debug your
program to understand what you do wrong or don't do that is needed.
And, again, learn about "the Rule of Three" and about patience.
Did I mention patience?
V
--
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