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Integer
, Cardinal
, and Word
define the three
“main branches” of GPC's integer types. You won't always be able
to deal with the natural size; sometimes something smaller or longer
will be needed. Especially when interfacing with libraries written
in other languages such as C, you will need equivalents for their
integer types.
The following variants of integer types (plus one Boolean type) are
guaranteed to be compatible to the respective types of GNU C as
listed below (whereas Integer
, Cardinal
and
Word
themselves are not guaranteed to be compatible to
any given C type). The sizes given, however, are not
guaranteed. They are just typical values currently used on some
platforms, but they may be actually shorter or longer on any given
platform.
signed | unsigned | also unsigned | GNU C equivalent | size in bits (example)
|
ByteInt | ByteCard | Byte | [un]signed char | 8
|
ShortInt | ShortCard | ShortWord | [unsigned] short int | 16
|
CInteger | CCardinal | CWord | [unsigned] int | 32
|
MedInt | MedCard | MedWord | [unsigned] long int | 32
|
LongInt | LongCard | LongWord | [unsigned] long long int | 64
|
— | SizeType | — | size_t | 32
|
PtrDiffType | — | — | ptrdiff_t | 32
|
PtrInt | PtrCard | PtrWord | — | 32
|
— | CBoolean | — | _Bool, bool | 8
|
Since we don't know whether LongInt
will always remain the
“longest” integer type available – maybe GNU C will get
long long long int
, one day, which we will support as
LongLongInt
– we have added the synonym LongestInt
for the longest available singed integer type, and the same holds
for LongestCard
and LongestWord
.