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Message from discussion Error in function not detected when not called
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kiran  
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 More options Aug 29 2012, 5:50 pm
Newsgroups: comp.lang.c++.moderated
From: kiran <kiran.tange...@googlemail.com>
Date: Wed, 29 Aug 2012 16:44:31 CST
Local: Wed, Aug 29 2012 6:44 pm
Subject: Error in function not detected when not called
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Hi have a following class:
====================================
template <class T>
class List
{
   protected:
   ListNode<T> *first;

   public:
   ...
   int remove(T& t);
   ...

};

//The member function is defined as:
template <class T>
int List<T>::remove(T& t)
{
     if(isEmpty()) return 0;
     ListNode<T> q = first;
     first = first->next;
     t = q->data;
     delete q;
     return 1;
}

====================================

The member function incorrectly assigns a ListNode object q to the
ListNode pointer first. However when I compile it (using g++ on
redhat) I dont get any error if I don't call the function. However, if
I do call the function somewhere in the program I get the error.

I have tried to compile using various optimization levels (O0, O1, O2,
O3) and yet compiler doesn't give error. Anyone knows why?

Many thanks,
Kiran

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