CElementTraitsBase Class
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at CElementTraitsBase Class.
This class provides default copy and move methods for a collection class.
Syntax
template<typename T>
class CElementTraitsBase
Parameters
T
The type of data to be stored in the collection.
Members
Public Typedefs
| Name | Description |
|---|---|
| CElementTraitsBase::INARGTYPE | The data type to use for adding elements to the collection class object. |
| CElementTraitsBase::OUTARGTYPE | The data type to use for retrieving elements from the collection class object. |
Public Methods
| Name | Description |
|---|---|
| CElementTraitsBase::CopyElements | Call this method to copy elements stored in a collection class object. |
| CElementTraitsBase::RelocateElements | Call this method to relocate elements stored in a collection class object. |
Remarks
This base class defines methods for copying and relocating elements in a collection class. It is utilized by the classes CDefaultElementTraits, CStringRefElementTraits, and CStringElementTraitsI.
For more information, see ATL Collection Classes.
Requirements
Header: atlcoll.h
CElementTraitsBase::CopyElements
Call this method to copy elements stored in a collection class object.
static void CopyElements(
T* pDest,
const T* pSrc,
size_t nElements);
Parameters
pDest
Pointer to the first element that will receive the copied data.
pSrc
Pointer to the first element to copy.
nElements
The number of elements to copy.
Remarks
The source and destination elements should not overlap.
CElementTraitsBase::INARGTYPE
The data type to use for adding elements to the collection.
typedef const T& INARGTYPE;
CElementTraitsBase::OUTARGTYPE
The data type to use for retrieving elements from the collection.
typedef T& OUTARGTYPE;
CElementTraitsBase::RelocateElements
Call this method to relocate elements stored in a collection class object.
static void RelocateElements(
T* pDest,
T* pSrc,
size_t nElements);
Parameters
pDest
Pointer to the first element that will receive the relocated data.
pSrc
Pointer to the first element to relocate.
nElements
The number of elements to relocate.
Remarks
This method calls memmove, which is sufficient for most data types. If the objects being moved contain pointers to their own members, this method will need to be overridden.