► |  | FFI: PLT Scheme Foreign Interface

1 | Overview
2 | Loading Foreign Libraries
3 | C Types
4 | Pointer Functions
5 | Miscellaneous Support
6 | Derived Utilities
7 | Unexported Primitive Functions
8 | Macros for Unsafety
| Index

▼ | 3 | C Types

3.1 | Type Constructors
3.2 | Numeric Types
3.3 | Other Atomic Types
3.4 | String Types
3.5 | Pointer Types
3.6 | Function Types
3.7 | C Struct Types
3.8 | Enumerations and Masks

On this page:

_ int8
_ sint8
_ uint8
_ int16
_ sint16
_ uint16
_ int32
_ sint32
_ uint32
_ int64
_ sint64
_ uint64
_ byte
_ sbyte
_ ubyte
_ short
_ sshort
_ ushort
_ int
_ sint
_ uint
_ word
_ sword
_ uword
_ long
_ slong
_ ulong
_ fixnum
_ ufixnum
_ fixint
_ ufixint
_ float
_ double
_ double*

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#### 3.2`` Numeric Types

_int8 : ctype?
_sint8 : ctype?
_uint8 : ctype?
_int16 : ctype?
_sint16 : ctype?
_uint16 : ctype?
_int32 : ctype?
_sint32 : ctype?
_uint32 : ctype?
_int64 : ctype?
_sint64 : ctype?
_uint64 : ctype?

The basic integer types at various sizes. The s or u prefix specifies a signed or an unsigned integer, respectively; the ones with no prefix are signed.

_byte : ctype?
_sbyte : ctype?
_ubyte : ctype?
_short : ctype?
_sshort : ctype?
_ushort : ctype?
_int : ctype?
_sint : ctype?
_uint : ctype?
_word : ctype?
_sword : ctype?
_uword : ctype?
_long : ctype?
_slong : ctype?
_ulong : ctype?

Aliases for basic integer types. The _byte aliases correspond to _int8. The _short and _word aliases correspond to _int16. The _int aliases correspond to _int32. The _long aliases correspond to either _int32 or _int64, depending on the platform.

_fixnum : ctype?
_ufixnum : ctype?

For cases where speed matters and where you know that the integer is small enough, the types _fixnum and _ufixnum are similar to _long and _ulong but assume that the quantities fit in PLT Scheme’s immediate integers (i.e., not bignums).

_fixint : ctype?
_ufixint : ctype?

Like _fixnum and _ufixnum, but coercions from C are checked to be in range.

_float : ctype?
_double : ctype?
_double* : ctype?

The _float and _double types represent the corresponding C types. The type _double* that implicitly coerces any real number to a C double.
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