| title |
readonly (C++) | Microsoft Docs |
| ms.custom |
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| ms.date |
11/04/2016 |
| ms.reviewer |
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| ms.suite |
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| ms.technology |
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| ms.tgt_pltfrm |
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| ms.topic |
language-reference |
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| ms.assetid |
1246cadd-5304-43a9-beea-51153d12704d |
| caps.latest.revision |
9 |
| author |
mikeblome |
| ms.author |
mblome |
| manager |
ghogen |
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Prohibits assignment to a data member.
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.
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();
};
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| Applies to |
Interface method |
| Repeatable |
No |
| Required attributes |
None |
| Invalid attributes |
None |
For more information about the attribute contexts, see Attribute Contexts.
IDL Attributes
Data Member Attributes