base-4.12.0.0: Basic libraries

Copyright(c) The FFI task force 2001
LicenseBSD-style (see the file libraries/base/LICENSE)
Maintainerffi@haskell.org
Stabilityprovisional
Portabilityportable
Safe HaskellTrustworthy
LanguageHaskell2010

Foreign.C.Types

Contents

Description

Mapping of C types to corresponding Haskell types.

Synopsis

Representations of C types

These types are needed to accurately represent C function prototypes, in order to access C library interfaces in Haskell. The Haskell system is not required to represent those types exactly as C does, but the following guarantees are provided concerning a Haskell type CT representing a C type t:

  • If a C function prototype has t as an argument or result type, the use of CT in the corresponding position in a foreign declaration permits the Haskell program to access the full range of values encoded by the C type; and conversely, any Haskell value for CT has a valid representation in C.
  • sizeOf (undefined :: CT) will yield the same value as sizeof (t) in C.
  • alignment (undefined :: CT) matches the alignment constraint enforced by the C implementation for t.
  • The members peek and poke of the Storable class map all values of CT to the corresponding value of t and vice versa.
  • When an instance of Bounded is defined for CT, the values of minBound and maxBound coincide with t_MIN and t_MAX in C.
  • When an instance of Eq or Ord is defined for CT, the predicates defined by the type class implement the same relation as the corresponding predicate in C on t.
  • When an instance of Num, Read, Integral, Fractional, Floating, RealFrac, or RealFloat is defined for CT, the arithmetic operations defined by the type class implement the same function as the corresponding arithmetic operations (if available) in C on t.
  • When an instance of Bits is defined for CT, the bitwise operation defined by the type class implement the same function as the corresponding bitwise operation in C on t.

Platform differences

This module contains platform specific information about types. __/As such the types presented on this page reflect the platform on which the documentation was generated and may not coincide with the types on your platform./__

Integral types

These types are represented as newtypes of types in Data.Int and Data.Word, and are instances of Eq, Ord, Num, Read, Show, Enum, Typeable, Storable, Bounded, Real, Integral and Bits.

newtype CChar Source #

Haskell type representing the C char type.

Constructors

CChar Int8 
Instances
Bounded CChar Source # 
Instance details

Defined in Foreign.C.Types

Enum CChar Source # 
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Defined in Foreign.C.Types

Eq CChar Source # 
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Defined in Foreign.C.Types

Methods

(==) :: CChar -> CChar -> Bool Source #

(/=) :: CChar -> CChar -> Bool Source #

Integral CChar Source # 
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Num CChar Source # 
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Ord CChar Source # 
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Read CChar Source # 
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Real CChar Source # 
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Show CChar Source # 
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FiniteBits CChar Source # 
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Bits CChar Source # 
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Storable CChar Source # 
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newtype CSChar Source #

Haskell type representing the C signed char type.

Constructors

CSChar Int8 
Instances
Bounded CSChar Source # 
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Defined in Foreign.C.Types

Enum CSChar Source # 
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Eq CSChar Source # 
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Integral CSChar Source # 
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Num CSChar Source # 
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Ord CSChar Source # 
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Read CSChar Source # 
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Real CSChar Source # 
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Show CSChar Source # 
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FiniteBits CSChar Source # 
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Bits CSChar Source # 
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Storable CSChar Source # 
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newtype CUChar Source #

Haskell type representing the C unsigned char type.

Constructors

CUChar Word8 
Instances
Bounded CUChar Source # 
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Enum CUChar Source # 
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Eq CUChar Source # 
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Integral CUChar Source # 
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Num CUChar Source # 
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Ord CUChar Source # 
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Read CUChar Source # 
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Real CUChar Source # 
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Show CUChar Source # 
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FiniteBits CUChar Source # 
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Bits CUChar Source # 
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Storable CUChar Source # 
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newtype CShort Source #

Haskell type representing the C short type.

Constructors

CShort Int16 
Instances
Bounded CShort Source # 
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Enum CShort Source # 
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Eq CShort Source # 
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Integral CShort Source # 
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Num CShort Source # 
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Ord CShort Source # 
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Read CShort Source # 
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Real CShort Source # 
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Show CShort Source # 
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FiniteBits CShort Source # 
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Bits CShort Source # 
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Storable CShort Source # 
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newtype CUShort Source #

Haskell type representing the C unsigned short type.

Constructors

CUShort Word16 
Instances
Bounded CUShort Source # 
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Enum CUShort Source # 
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Eq CUShort Source # 
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Integral CUShort Source # 
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Num CUShort Source # 
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Ord CUShort Source # 
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Read CUShort Source # 
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Real CUShort Source # 
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Show CUShort Source # 
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FiniteBits CUShort Source # 
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Bits CUShort Source # 
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Storable CUShort Source # 
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newtype CInt Source #

Haskell type representing the C int type.

Constructors

CInt Int32 
Instances
Bounded CInt Source # 
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Enum CInt Source # 
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Eq CInt Source # 
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Methods

(==) :: CInt -> CInt -> Bool Source #

(/=) :: CInt -> CInt -> Bool Source #

Integral CInt Source # 
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Num CInt Source # 
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Ord CInt Source # 
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Read CInt Source # 
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Real CInt Source # 
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Show CInt Source # 
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FiniteBits CInt Source # 
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Bits CInt Source # 
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Storable CInt Source # 
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newtype CUInt Source #

Haskell type representing the C unsigned int type.

Constructors

CUInt Word32 
Instances
Bounded CUInt Source # 
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Enum CUInt Source # 
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Eq CUInt Source # 
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Methods

(==) :: CUInt -> CUInt -> Bool Source #

(/=) :: CUInt -> CUInt -> Bool Source #

Integral CUInt Source # 
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Num CUInt Source # 
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Ord CUInt Source # 
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Read CUInt Source # 
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Real CUInt Source # 
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Show CUInt Source # 
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FiniteBits CUInt Source # 
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Bits CUInt Source # 
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Storable CUInt Source # 
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newtype CLong Source #

Haskell type representing the C long type.

Constructors

CLong Int32 
Instances
Bounded CLong Source # 
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Enum CLong Source # 
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Eq CLong Source # 
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Methods

(==) :: CLong -> CLong -> Bool Source #

(/=) :: CLong -> CLong -> Bool Source #

Integral CLong Source # 
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Num CLong Source # 
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Ord CLong Source # 
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Read CLong Source # 
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Real CLong Source # 
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Show CLong Source # 
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FiniteBits CLong Source # 
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Bits CLong Source # 
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Storable CLong Source # 
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newtype CULong Source #

Haskell type representing the C unsigned long type.

Constructors

CULong Word32 
Instances
Bounded CULong Source # 
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Enum CULong Source # 
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Eq CULong Source # 
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Integral CULong Source # 
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Num CULong Source # 
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Ord CULong Source # 
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Read CULong Source # 
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Real CULong Source # 
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Show CULong Source # 
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FiniteBits CULong Source # 
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Bits CULong Source # 
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Storable CULong Source # 
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newtype CPtrdiff Source #

Haskell type representing the C ptrdiff_t type.

Constructors

CPtrdiff Int32 
Instances
Bounded CPtrdiff Source # 
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Enum CPtrdiff Source # 
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Eq CPtrdiff Source # 
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Integral CPtrdiff Source # 
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Num CPtrdiff Source # 
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Ord CPtrdiff Source # 
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Read CPtrdiff Source # 
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Real CPtrdiff Source # 
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Show CPtrdiff Source # 
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FiniteBits CPtrdiff Source # 
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Bits CPtrdiff Source # 
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Storable CPtrdiff Source # 
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newtype CSize Source #

Haskell type representing the C size_t type.

Constructors

CSize Word32 
Instances
Bounded CSize Source # 
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Enum CSize Source # 
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Eq CSize Source # 
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Methods

(==) :: CSize -> CSize -> Bool Source #

(/=) :: CSize -> CSize -> Bool Source #

Integral CSize Source # 
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Num CSize Source # 
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Ord CSize Source # 
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Read CSize Source # 
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Real CSize Source # 
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Show CSize Source # 
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FiniteBits CSize Source # 
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Bits CSize Source # 
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Storable CSize Source # 
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newtype CWchar Source #

Haskell type representing the C wchar_t type.

Constructors

CWchar Int32 
Instances
Bounded CWchar Source # 
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Enum CWchar Source # 
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Eq CWchar Source # 
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Integral CWchar Source # 
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Num CWchar Source # 
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Ord CWchar Source # 
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Read CWchar Source # 
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Real CWchar Source # 
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Show CWchar Source # 
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FiniteBits CWchar Source # 
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Bits CWchar Source # 
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Storable CWchar Source # 
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newtype CSigAtomic Source #

Haskell type representing the C sig_atomic_t type.

Constructors

CSigAtomic Int32 
Instances
Bounded CSigAtomic Source # 
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Enum CSigAtomic Source # 
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Eq CSigAtomic Source # 
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Integral CSigAtomic Source # 
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Num CSigAtomic Source # 
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Ord CSigAtomic Source # 
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Read CSigAtomic Source # 
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Real CSigAtomic Source # 
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Show CSigAtomic Source # 
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FiniteBits CSigAtomic Source # 
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Bits CSigAtomic Source # 
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Storable CSigAtomic Source # 
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newtype CLLong Source #

Haskell type representing the C long long type.

Constructors

CLLong Int64 
Instances
Bounded CLLong Source # 
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Defined in Foreign.C.Types

Enum CLLong Source # 
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Eq CLLong Source # 
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Defined in Foreign.C.Types

Integral CLLong Source # 
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Defined in Foreign.C.Types

Num CLLong Source # 
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Defined in Foreign.C.Types

Ord CLLong Source # 
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Defined in Foreign.C.Types

Read CLLong Source # 
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Real CLLong Source # 
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Show CLLong Source # 
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FiniteBits CLLong Source # 
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Defined in Foreign.C.Types

Bits CLLong Source # 
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Defined in Foreign.C.Types

Storable CLLong Source # 
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newtype CULLong Source #

Haskell type representing the C unsigned long long type.

Constructors

CULLong Word64 
Instances
Bounded CULLong Source # 
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Defined in Foreign.C.Types

Enum CULLong Source # 
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Eq CULLong Source # 
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Integral CULLong Source # 
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Defined in Foreign.C.Types

Num CULLong Source # 
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Defined in Foreign.C.Types

Ord CULLong Source # 
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Defined in Foreign.C.Types

Read CULLong Source # 
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Real CULLong Source # 
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Defined in Foreign.C.Types

Show CULLong Source # 
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FiniteBits CULLong Source # 
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Bits CULLong Source # 
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Storable CULLong Source # 
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newtype CBool Source #

Haskell type representing the C bool type.

Since: 4.10.0.0

Constructors

CBool Word8 
Instances
Bounded CBool Source # 
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Defined in Foreign.C.Types

Enum CBool Source # 
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Eq CBool Source # 
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Defined in Foreign.C.Types

Methods

(==) :: CBool -> CBool -> Bool Source #

(/=) :: CBool -> CBool -> Bool Source #

Integral CBool Source # 
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Num CBool Source # 
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Ord CBool Source # 
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Read CBool Source # 
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Real CBool Source # 
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Show CBool Source # 
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FiniteBits CBool Source # 
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Bits CBool Source # 
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Storable CBool Source # 
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newtype CIntPtr Source #

Constructors

CIntPtr Int32 
Instances
Bounded CIntPtr Source # 
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Enum CIntPtr Source # 
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Eq CIntPtr Source # 
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Integral CIntPtr Source # 
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Num CIntPtr Source # 
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Ord CIntPtr Source # 
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Read CIntPtr Source # 
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Real CIntPtr Source # 
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Show CIntPtr Source # 
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FiniteBits CIntPtr Source # 
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Bits CIntPtr Source # 
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Storable CIntPtr Source # 
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newtype CUIntPtr Source #

Constructors

CUIntPtr Word32 
Instances
Bounded CUIntPtr Source # 
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Enum CUIntPtr Source # 
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Eq CUIntPtr Source # 
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Integral CUIntPtr Source # 
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Num CUIntPtr Source # 
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Ord CUIntPtr Source # 
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Read CUIntPtr Source # 
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Real CUIntPtr Source # 
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Show CUIntPtr Source # 
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FiniteBits CUIntPtr Source # 
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Bits CUIntPtr Source # 
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Storable CUIntPtr Source # 
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newtype CIntMax Source #

Constructors

CIntMax Int64 
Instances
Bounded CIntMax Source # 
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Enum CIntMax Source # 
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Eq CIntMax Source # 
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Integral CIntMax Source # 
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Num CIntMax Source # 
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Ord CIntMax Source # 
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Read CIntMax Source # 
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Real CIntMax Source # 
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Show CIntMax Source # 
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FiniteBits CIntMax Source # 
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Bits CIntMax Source # 
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Storable CIntMax Source # 
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newtype CUIntMax Source #

Constructors

CUIntMax Word64 
Instances
Bounded CUIntMax Source # 
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Enum CUIntMax Source # 
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Eq CUIntMax Source # 
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Integral CUIntMax Source # 
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Num CUIntMax Source # 
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Ord CUIntMax Source # 
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Read CUIntMax Source # 
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Real CUIntMax Source # 
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Show CUIntMax Source # 
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FiniteBits CUIntMax Source # 
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Bits CUIntMax Source # 
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Storable CUIntMax Source # 
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Defined in Foreign.C.Types

Numeric types

These types are represented as newtypes of basic foreign types, and are instances of Eq, Ord, Num, Read, Show, Enum, Typeable and Storable.

newtype CClock Source #

Haskell type representing the C clock_t type.

Constructors

CClock Word32 
Instances
Enum CClock Source # 
Instance details

Defined in Foreign.C.Types

Eq CClock Source # 
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Num CClock Source # 
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Ord CClock Source # 
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Read CClock Source # 
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Real CClock Source # 
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Show CClock Source # 
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Storable CClock Source # 
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newtype CTime Source #

Haskell type representing the C time_t type.

Constructors

CTime Int32 
Instances
Enum CTime Source # 
Instance details

Defined in Foreign.C.Types

Eq CTime Source # 
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Defined in Foreign.C.Types

Methods

(==) :: CTime -> CTime -> Bool Source #

(/=) :: CTime -> CTime -> Bool Source #

Num CTime Source # 
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Defined in Foreign.C.Types

Ord CTime Source # 
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Read CTime Source # 
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Real CTime Source # 
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Show CTime Source # 
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Storable CTime Source # 
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Defined in Foreign.C.Types

newtype CUSeconds Source #

Haskell type representing the C useconds_t type.

Since: 4.4.0.0

Constructors

CUSeconds Word32 
Instances
Enum CUSeconds Source # 
Instance details

Defined in Foreign.C.Types

Eq CUSeconds Source # 
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Num CUSeconds Source # 
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Ord CUSeconds Source # 
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Read CUSeconds Source # 
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Real CUSeconds Source # 
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Show CUSeconds Source # 
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Storable CUSeconds Source # 
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Defined in Foreign.C.Types

newtype CSUSeconds Source #

Haskell type representing the C suseconds_t type.

Since: 4.4.0.0

Constructors

CSUSeconds Int32 
Instances
Enum CSUSeconds Source # 
Instance details

Defined in Foreign.C.Types

Eq CSUSeconds Source # 
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Num CSUSeconds Source # 
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Ord CSUSeconds Source # 
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Read CSUSeconds Source # 
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Real CSUSeconds Source # 
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Show CSUSeconds Source # 
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Storable CSUSeconds Source # 
Instance details

Defined in Foreign.C.Types

To convert CTime to UTCTime, use the following:

\t -> posixSecondsToUTCTime (realToFrac t :: POSIXTime)

Floating types

These types are represented as newtypes of Float and Double, and are instances of Eq, Ord, Num, Read, Show, Enum, Typeable, Storable, Real, Fractional, Floating, RealFrac and RealFloat. That does mean that CFloat's (respectively CDouble's) instances of Eq, Ord, Num and Fractional are as badly behaved as Float's (respectively Double's).

newtype CFloat Source #

Haskell type representing the C float type.

Constructors

CFloat Float 
Instances
Enum CFloat Source # 
Instance details

Defined in Foreign.C.Types

Eq CFloat Source # 
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Floating CFloat Source # 
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Fractional CFloat Source # 
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Num CFloat Source # 
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Ord CFloat Source # 
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Read CFloat Source # 
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Real CFloat Source # 
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RealFloat CFloat Source # 
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Defined in Foreign.C.Types

RealFrac CFloat Source # 
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Defined in Foreign.C.Types

Show CFloat Source # 
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Defined in Foreign.C.Types

Storable CFloat Source # 
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Defined in Foreign.C.Types

newtype CDouble Source #

Haskell type representing the C double type.

Constructors

CDouble Double 
Instances
Enum CDouble Source # 
Instance details

Defined in Foreign.C.Types

Eq CDouble Source # 
Instance details

Defined in Foreign.C.Types

Floating CDouble Source # 
Instance details

Defined in Foreign.C.Types

Fractional CDouble Source # 
Instance details

Defined in Foreign.C.Types

Num CDouble Source # 
Instance details

Defined in Foreign.C.Types

Ord CDouble Source # 
Instance details

Defined in Foreign.C.Types

Read CDouble Source # 
Instance details

Defined in Foreign.C.Types

Real CDouble Source # 
Instance details

Defined in Foreign.C.Types

RealFloat CDouble Source # 
Instance details

Defined in Foreign.C.Types

RealFrac CDouble Source # 
Instance details

Defined in Foreign.C.Types

Show CDouble Source # 
Instance details

Defined in Foreign.C.Types

Storable CDouble Source # 
Instance details

Defined in Foreign.C.Types

Other types

data CFile Source #

Haskell type representing the C FILE type.

data CFpos Source #

Haskell type representing the C fpos_t type.

data CJmpBuf Source #

Haskell type representing the C jmp_buf type.