typedef
/*
IDL file typedef syntax */
typedef [ [ idl-type-attribute-list ] ] type-specifier
declarator-list;
/*
ACF typedef syntax */
typedef [ acf-type-attribute-list ] typename;
idl-type-attribute-list
Specifies one
or more attributes that apply to the type. Valid type attributes in an IDL file
include handle, switch_type, transmit_as; the pointer attribute
ref, unique, or ptr; and the usage attributes context_handle,
string, and ignore. Separate multiple attributes with commas.
type-specifier
Specifies a base_type,
struct, union, enum type, or type identifier. An optional
storage specification can precede type-specifier. The const
keyword can precede type-specifier.
declarator-list
Specifies
standard C declarators, such as identifiers, pointer declarators, and array
declarators. For more information, see pointers and arrays. The declarator-list
consists of one or more declarators, separated by commas.
acf-type-attribute-list
Specifies one
or more attributes that apply to the type. Valid type attributes in an ACF
include allocate, encode, and decode.
typename
Specifies a
type defined in the IDL file.
Remarks
The IDL typedef
keyword allows typedef declarations that are very similar to C-language typedef
declarations. The IDL typedef declaration is augmented to allow you to
associate type attributes with the defined types. Valid type attributes include
handle, switch_type, transmit_as; the pointer attribute ref, unique, or ptr; and the usage attributes context_handle, string, and ignore.
The typedef
keyword in an ACF applies attributes to types that are defined in the
corresponding IDL file. For example, the allocate type attribute allows
you to customize memory allocation and deallocation by both the application and
the stubs.
The ACF typedef
statement appears as part of the ACF_body. Note that the ACF typedef
syntax is different from the IDL typedef syntax and the C-language typedef
syntax. No new types can be introduced in the ACF.
See Also