Attributes Alphabetical Reference

The following attributes are available in the Microsoft C++ compiler:

Attribute Description
aggregatable Indicates that a control can be aggregated by another control.
aggregates Indicates that a control aggregates the target class.
appobject Identifies the coclass as an application object, which is associated with a full EXE application, and indicates that the functions and properties of the coclass are globally available in this type library.
async_uuid Specifies the UUID that directs the MIDL compiler to define both synchronous and asynchronous versions of a COM interface.
attribute Allows you to create a custom attribute.
bindable Indicates that the property supports data binding.
call_as Enables a nonremotable function to be mapped to a remote function.
case Used with the switch_type attribute in a union.
coclass Creates a COM object, which can implement a COM interface.
com_interface_entry Adds an interface entry to a COM map.
control Specifies that the user-defined type is a control.
cpp_quote Emits the specified string, without the quote characters, into the generated header file.
custom Lets you define your own attributes.
db_accessor Binds columns in a rowset and binds them to the corresponding accessor maps.
db_column Binds a specified column to the rowset.
db_command Executes an OLE DB command.
db_param Associates the specified member variable with an input or output parameter.
db_source Creates and encapsulates a connection, through a provider, to a data source.
db_table Opens an OLE DB table.
default Indicates that the custom or dispinterface defined within a coclass represents the default programmability interface.
defaultbind Indicates the single, bindable property that best represents the object.
defaultcollelem Used for Visual Basic code optimization.
defaultvalue Allows specification of a default value for a typed optional parameter.
defaultvtable Defines an interface as the default vtable interface for a control.
dispinterface Places an interface in the .idl file as a dispatch interface.
displaybind Indicates a property that should be displayed to the user as bindable.
dual Places an interface in the .idl file as a dual interface.
emitidl Determines whether all subsequent IDL attributes will be processed and placed in the generated .idl file.
entry Specifies an exported function or constant in a module by identifying the entry point in the DLL.
event_receiver Creates an event receiver.
event_source Creates an event source.
export Causes a data structure to be placed in the .idl file.
first_is Specifies the index of the first array element to be transmitted.
helpcontext Specifies a context ID that lets the user view information about this element in the Help file.
helpfile Sets the name of the Help file for a type library.
helpstring Specifies the ID of a help topic in an .hlp or .chm file.
helpstringdll Specifies the name of the DLL to use to perform document string lookup (localization).
hidden Indicates that the item exists but should not be displayed in a user-oriented browser.
id Specifies a DISPID for a member function (either a property or a method, in an interface or dispinterface).
idl_module Specifies an entry point in a DLL.
idl_quote Allows you to use attributes or IDL constructs that are not supported in the current version of Visual C++.
iid_is Specifies the IID of the COM interface pointed to by an interface pointer.
immediatebind Indicates that the database will be notified immediately of all changes to a property of a data-bound object.
implements Specifies dispatch interfaces that are forced to be members of the IDL coclass.
implements_category Specifies implemented component categories for the class.
import Specifies another .idl, .odl, or header file containing definitions you want to reference from your main .idl file.
importidl Inserts the specified .idl file into the generated .idl file.
importlib Makes types that have already been compiled into another type library available to the type library being created.
in Indicates that a parameter is to be passed from the calling procedure to the called procedure.
include Specifies one or more header files to be included in the generated .idl file.
includelib Causes an .idl or .h file to be included in the generated .idl file.
last_is Specifies the index of the last array element to be transmitted.
lcid Lets you pass a locale identifier to a function.
length_is Specifies the number of array elements to be transmitted.
library_block Places a construct inside the .idl file's library block.
licensed Indicates that the coclass to which it applies is licensed, and must be instantiated using IClassFactory2.
local Allows you to use the MIDL compiler as a header generator when used in the interface header. When used in an individual function, designates a local procedure for which no stubs are generated.
max_is Designates the maximum value for a valid array index.
module Defines the library block in the .idl file.
ms_union Controls the network data representation alignment of nonencapsulated unions.
no_injected_text Prevents the compiler from injecting code as a result of attribute use.
nonbrowsable Indicates that an interface member should not be displayed in a property browser.
noncreatable Defines an object that cannot be instantiated by itself.
nonextensible Specifies that the IDispatch implementation includes only the properties and methods listed in the interface description and cannot be extended with additional members at run time.
object Identifies a custom interface; synonymous with custom attribute.
odl Identifies an interface as an Object Description Language (ODL) interface.
oleautomation Indicates that an interface is compatible with Automation.
optional Specifies an optional parameter for a member function.
out Identifies pointer parameters that are returned from the called procedure to the calling procedure (from the server to the client).
pointer_default Specifies the default pointer attribute for all pointers except top-level pointers that appear in parameter lists.
pragma Emits the specified string, without the quote characters, into the generated .idl file.
progid Specifies the ProgID for a COM object.
propget Specifies a property accessor (get) function.
propput Specifies a property setting function.
propputref Specifies a property setting function that uses a reference instead of a value.
ptr Designates a pointer as a full pointer.
public Ensures that a typedef will go into the type library even if it is not referenced from within the .idl file.
range Specifies a range of allowable values for arguments or fields whose values are set at run time.
rdx Creates or modifies a registry key.
readonly Prohibits assignment to a variable.
ref Identifies a reference pointer.
registration_script Executes the specified registration script.
requestedit Indicates that the property supports the OnRequestEdit notification.
requires_category Specifies required component categories for the class.
restricted Specifies that a library, or member of a module, interface, or dispinterface cannot be called arbitrarily.
retval Designates the parameter that receives the return value of the member.
satype Specifies the data type of the SAFEARRAY.
size_is Specifies the size of memory allocated for sized pointers, sized pointers to sized pointers, and single- or multidimensional arrays.
source Indicates that a member of a class, property, or method is a source of events.
string Indicates that the one-dimensional char, wchar_t, byte, or equivalent array or the pointer to such an array must be treated as a string.
support_error_info Supports error reporting for the target object.
switch_is Specifies the expression or identifier acting as the union discriminant that selects the union member.
switch_type Identifies the type of the variable used as the union discriminant.
synchronize Synchronizes access to a method.
threading Specifies the threading model for a COM object.
transmit_as Instructs the compiler to associate a presented type, which client and server applications manipulate, with a transmitted type.
uidefault Indicates that the type information member is the default member for display in the user interface.
unique Specifies a unique pointer.
usesgetlasterror Tells the caller that if there is an error when calling that function, the caller can then call GetLastError to retrieve the error code.
uuid Specifies the unique ID for a class or interface.
v1_enum Directs that the specified enumerated type be transmitted as a 32-bit entity, rather than the 16-bit default.
vararg Specifies that the function take a variable number of arguments.
version Identifies a particular version among multiple versions of an interface or class.
vi_progid Specifies a version-independent form of the ProgID.
wire_marshal Specifies a data type that will be used for transmission instead of an application-specific data type.

See also

C++ Attributes for COM and .NET
Attributes by Group
Attributes by Usage