TYPEDEF (Create a User-Defined Type Name)

Defines a Typedef-TypeName that is an alias for another type declaration.

Syntax

TypeName TYPEDEF Type-Declaration

Remarks

The TypeName entry is a unique globally-scoped Identifier that must be specified. Upon successful processing of the TYPEDEF directive, the TypeName entry is converted to a Typedef-TypeName which can then be used in expressions or as a directive in data allocation statements.

The TYPEDEF directive can be used to create a direct alias for another intrinsic type (a Scalar-TypeName, Record-TypeName, Structure-TypeName, Union-TypeName, or other Typedef-TypeName), a pointer to another type, or it can be used to create vector types (arrays).

Examples

The following are examples of TYPEDEF usage:

CHAR      typedef byte                 ; CHAR is an alias for intrinsic type
PCHAR     typedef ptr CHAR             ; PCHAR is a pointer to CHAR

BUFFER_T  struct
  pLetter PCHAR   ?                    ; current position in buffer
  Letters CHAR    "ABCDEF",0           ; array of characters
BUFFER_T  ends

BUFFER    typedef BUFFER_T             ; alias for intrinsic type
PBUFFER   typedef ptr BUFFER_T         ; pointer to the BUFFER type

DATA      SEGMENT
HexChars  BUFFER  <>                   ; allocate structure via typedef
pHexChars PBUFFER offset HexChars      ; point to the allocated structure
DATA      ENDS

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