Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Deref

Each instance of a Pre or Post attribute specifies a set of properties for the annotated parameter or return value at a particular level of dereference. The level of dereference is specified by the Deref property of the attribute, and all properties appearing after a Deref property are applied to that level of dereference. For example, given a parameter p, an attribute with Deref=0 specifies the properties for p, Deref=1 specifies the properties for *p, Deref=2 specifies the properties for **p, and so on. The value of the Deref should be greater than or equal to 0 and less than or equal to 3.

NoteNote:

The default value for this property is 0.

For a parameter of reference type, for example, int& r, Deref=0 applies to the reference itself; Deref=1 applies to the referred-to location, which is - the int in this case.

The following code specifies Deref=1, which applies the Access property to the buffer pointed to by the pointer.

// C
#include <CodeAnalysis\SourceAnnotations.h>
void f ( [ SA_Pre ( Deref = 1, Access = SA_ReadWrite ) ] char *p );

// C++
#include <CodeAnalysis\SourceAnnotations.h>
using namespace vc_attributes;
void f ( [ Pre ( Deref = 1, Access = ReadWrite ) ] char *p );

Community Additions

ADD
Show:
© 2015 Microsoft