library-block.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: library_block	library_block (C++ COM Attribute)	10/02/2018	vc-attr.library_block	library_block attribute	ae7a7ebe-5e1a-4eda-a058-11bbd058ece8

library_block

Places a construct inside the IDL library block.

Syntax

[library_block]

Remarks

When you place a construct inside the library block, you ensure that it will be passed into the type library, regardless of whether it is referenced. By default, only constructs modified by the coclass, dispinterface, and idl_module attributes are placed in the library block.

Example

In the following code, a custom interface is placed inside the library block.

// cpp_attr_ref_library_block.cpp
// compile with: /LD
#include <windows.h>
[module(name="MyLib")];
[object, library_block, uuid("9E66A290-4365-11D2-A997-00C04FA37DDB")]
__interface IMyInterface {
   HRESULT f1();
};

Requirements

Attribute context	Value
Applies to	Anywhere
Repeatable	No
Required attributes	None
Invalid attributes	None

For more information, see Attribute Contexts.

See also

Compiler Attributes
Stand-Alone Attributes