The IDL typedef keyword allows typedef declarations that are very similar to C-language typedef declarations.
/* IDL file typedef syntax */ typedef [[ [ idl-type-attribute-list ] ]] type-specifier declarator-list; /* ACF typedef syntax */ typedef [ acf-type-attribute-list ] typename;
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.
Specifies standard MIDL declarators, such as identifiers, pointer declarators, and array declarators. For more information, see Array and Sized-Pointer Attributes, arrays, and Arrays and Pointers. The declarator-list consists of one or more declarators, separated by commas.
Specifies a type defined in the IDL file.
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.
- Application Configuration File (ACF)
- Interface Definition (IDL) File