This documentation is archived and is not being maintained.

readonly

Prohibits assignment to a data member.

[readonly]

Attribute Context

Applies to Interface method
Repeatable No
Required attributes None
Invalid attributes None

For more information about the attribute contexts, see Attribute Contexts.

Remarks

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

If you want to prohibit modification of a method parameter, then use the in attribute.

Example

The following code shows a use of the readonly attribute:

// cpp_attr_ref_readonly.cpp
// compile with: /LD
[idl_quote("midl_pragma warning(disable:2461)")];
#include "unknwn.h"
[module(name="ATLFIRELib")];

[dispinterface, uuid(11111111-1111-1111-1111-111111111111)]
__interface IFireTabCtrl
{
   [readonly, id(1)] int i();
};

See Also

IDL Attributes | Data Member Attributes | Attributes Samples

Show: