Annotating Structs and Classes

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11/15/2016

Note

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You can annotate struct and class members by using annotations that act like invariants—they are presumed to be true at any function call or function entry/exit that involves the enclosing structure as a parameter or a result value.

Struct and Class Annotations

_Field_range_(low, high)

The field is in the range (inclusive) from low to high. Equivalent to _Satisfies_(_Curr_ >= low && _Curr_ <= high) applied to the annotated object by using the appropriate pre or post conditions.
_Field_size_(size), _Field_size_opt_(size), _Field_size_bytes_(size), _Field_size_bytes_opt_(size)

A field that has a writable size in elements (or bytes) as specified by size.
_Field_size_part_(size, count), _Field_size_part_opt_(size, count), _Field_size_bytes_part_(size, count), _Field_size_bytes_part_opt_(size, count)

A field that has a writable size in elements (or bytes) as specified by size, and the count of those elements (bytes) that are readable.
_Field_size_full_(size), _Field_size_full_opt_(size), _Field_size_bytes_full_(size), _Field_size_bytes_full_opt_(size)

A field that has both readable and writable size in elements (or bytes) as specified by size.
_Struct_size_bytes_(size)

A field that has both readable and writable size in elements (or bytes) as specified by size.

Applies to struct or class declaration. Indicates that a valid object of that type may be larger than the declared type, with the number of bytes being specified by size. For example:
```
typedef _Struct_size_bytes_(nSize)  
struct MyStruct {  
    size_t nSize;  
    …  
};  
```
The buffer size in bytes of a parameter pM of type MyStruct * is then taken to be:
```
min(pM->nSize, sizeof(MyStruct))  
```

共用方式為

Annotating Structs and Classes

Struct and Class Annotations

See Also

其他資源