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length_is

Specifies the number of array elements to be transmitted.

[ 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

Concepts

IDL Attributes

Typedef, Enum, Union, and Struct Attributes

Parameter Attributes

first_is

max_is

last_is

size_is

ATL Samples