length_is

 

The latest version of this topic can be found at length_is.

Specifies the number of array elements to be transmitted.

Syntax

  
      [ length_is(  
   "expression"  
) ]  

Parameters

expression
One or more C-language expressions. Empty argument slots are allowed.

Remarks

The length_is C++ attribute has the same functionality as the length_is MIDL attribute.

Example

See first_is for an example of how to specify a section of an array.

Requirements

Attribute Context

Applies to	Field in struct or union, interface parameter, interface method
Repeatable	No
Required attributes	None
Invalid attributes	None

For more information, see Attribute Contexts.

See Also

IDL Attributes
Typedef, Enum, Union, and Struct Attributes
Parameter Attributes
first_is
max_is
last_is
size_is
Attributes Samples