enum
enum [tag ] { identifier [=integer-value
] [ , ... ] }
tag
Specifies an
optional tag for the enumerated type.
identifier
Specifies the
particular enumeration.
integer-value
Specifies a
constant integer value.
Examples
typedef enum { Monday=2, Tuesday, Wednesday,
Thursday, Friday} workdays;
typedef enum { Clemens=21, Palmer=22, Ryan=34}
pitchers;
Remarks
The keyword enum
is used to identify an enumerated type. Enum types can appear as type
specifiers in typedef declarations, general declarations, and function
declarators (either as the function-return-type or as a parameter-type
specifier). For the context in which type specifiers appear, see IDL.
In the MIDL
compiler s default mode, you can assign integer values to enumerators. (This
feature is not available when you compile with the /osf switch.) As with
C-language enumerators, enumerator names must be unique, but the enumerator
values need not be.
When
assignment operators are not provided, identifiers are mapped to consecutive
integers from left to right, starting with zero. When assignment operators are
provided, assigned values start from the most recently assigned value.
The maximum
number of identifiers is 65,535.
Objects of
type enum are int types, and their size is system-dependent. By
default, objects of enum types are treated as 16-bit objects of type unsigned
short when transmitted over a network. Values outside the range 0 - 32,767
cause the run-time exception RPC_X_ENUM_VALUE_OUT_OF_RANGE. To transmit objects
as 32-bit entities, apply the v1_enum attribute to the enum typedef.
See Also