CTypedPtrList Class
Provides a type-safe "wrapper" for objects of class CPtrList.
template< class BASE_CLASS, class TYPE >
class CTypedPtrList : public BASE_CLASS
Parameters
BASE_CLASS
Base class of the typed pointer list class; must be a pointer list class (CObList or CPtrList).TYPE
Type of the elements stored in the base-class list.
Members
Public Methods
Name |
Description |
|---|---|
Adds an element (or all the elements in another list) to the head of the list (makes a new head). |
|
Adds an element (or all the elements in another list) to the tail of the list (makes a new tail). |
|
Gets the element at a given position. |
|
Returns the head element of the list (cannot be empty). |
|
Gets the next element for iterating. |
|
Gets the previous element for iterating. |
|
Returns the tail element of the list (cannot be empty). |
|
Removes the element from the head of the list. |
|
Removes the element from the tail of the list. |
|
Sets the element at a given position. |
Remarks
When you use CTypedPtrList rather than CObList or CPtrList, the C++ type-checking facility helps eliminate errors caused by mismatched pointer types.
In addition, the CTypedPtrList wrapper performs much of the casting that would be required if you used CObList or CPtrList.
Because all CTypedPtrList functions are inline, use of this template does not significantly affect the size or speed of your code.
Lists derived from CObList can be serialized, but those derived from CPtrList cannot.
When a CTypedPtrList object is deleted, or when its elements are removed, only the pointers are removed, not the entities they reference.
For more information on using CTypedPtrList, see the articles Collections and Template-Based Classes.
Example
This example creates an instance of CTypedPtrList, adds one object, serializes the list to disk, and then deletes the object:
typedef CTypedPtrList<CObList, CMyObject*> CMyList;
CMyList ml;
CMyObject* pMyObject = new CMyObject();
ml.AddTail(pMyObject);
CFileException e;
CFile myFile;
myFile.Open(_T("CTypedPtrList_File.txt"),
CFile::modeCreate|CFile::modeWrite, &e);
CArchive ar(&myFile, CArchive::store);
ml.Serialize(ar);
ar.Close();
myFile.Close();
while (!ml.IsEmpty())
{
delete ml.GetHead();
ml.RemoveHead();
}
class CMyObject : public CObject
{
public:
int i;
void Serialize(CArchive& ar);
CMyObject() { i = 9876;}
protected:
DECLARE_SERIAL(CMyObject)
};
IMPLEMENT_SERIAL(CMyObject, CObject, 0)
void CMyObject::Serialize(CArchive& ar)
{
CObject::Serialize(ar);
if(ar.IsStoring())
ar << i;
else
ar >> i;
}
Inheritance Hierarchy
BASE_CLASS
_CTypedPtrList
CTypedPtrList
Requirements
Header: afxtempl.h