C / C++ / MFC

// Bad: will slice types derived from Vessel
list<Vessel> myList;

// Ok: But you have to delete the objects your self, when finished with them
list<Vessel*> myList;

William Burton wrote:

Does this mean that i will have to have make a variable of each type in order to store any type?

{
    SSK temp; // Make an object on the stack.
    list.addNode(&temp); // Add a pointer to the temporary object to the list.
}
// When we get here the local "temp" no longer exists as it has gone out of scope.
// But we placed a pointer to it in "list": this means we have a pointer in "list"
// to an object that doesn't exist.

SSK pTemp = new SSK; // Create an object on the heap.
list.addNode(pTemp); // Add a pointer to the object to the list.

// Helper class - Put it in some .h file somewhere.
template <typename T>
struct Delete_Object
{
    bool operator()(T *pObj) const
    {
       delete pObj;
       return true;
        // Just returning a value for MSVC6 (it's got a bug which forces us to).
    }
};
 
// With this helper class we can delete all the contents of "list" and empty it like this
// (assuming you're using STL for "list". I don't think you are because of the function <code>addNode</code>.
// You'll have to adapt this code).
for_each(list.begin(), list.end(), Delete_Object<Vessel>());
list.clear();

class Vessel
{
public:
    virtual ~Vessel()
    {
       // Clean stuff up here if you need to.
    }
};

John R. Shaw wrote:

“Testing can show the presence of errors, but not their absence.”
Edsger Dijkstra

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

lekshmipriya wrote:

ShellExecute(NULL, "open", "winzip.exe", "-e -s"+bcs+" E:\\bcs.zip","C:\\extract\\here", SW_SHOWNORMAL);

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb