| description | title | ms.date | f1_keywords | helpviewer_keywords | ms.assetid | ||
|---|---|---|---|---|---|---|---|
Learn more about: readonly (C++) |
readonly (C++ COM Attribute) |
10/02/2018 |
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1246cadd-5304-43a9-beea-51153d12704d |
Prohibits assignment to a data member.
[readonly]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.
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();
};| Attribute context | Value |
|---|---|
| Applies to | Interface method |
| Repeatable | No |
| Required attributes | None |
| Invalid attributes | None |
For more information about the attribute contexts, see Attribute Contexts.