base-4.16.0.0: 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

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. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CChar Int8 

Instances

Instances details
Storable CChar # 
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Defined in Foreign.C.Types

Bits CChar # 
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FiniteBits CChar # 
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Bounded CChar # 
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Enum CChar # 
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Num CChar # 
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Read CChar # 
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Integral CChar # 
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Real CChar # 
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Show CChar # 
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Eq CChar # 
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Methods

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

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

Ord CChar # 
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Defined in Foreign.C.Types

newtype CSChar Source #

Haskell type representing the C signed char type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CSChar Int8 

Instances

Instances details
Storable CSChar # 
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Defined in Foreign.C.Types

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

Haskell type representing the C unsigned char type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CUChar Word8 

Instances

Instances details
Storable CUChar # 
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Defined in Foreign.C.Types

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

Haskell type representing the C short type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CShort Int16 

Instances

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

Haskell type representing the C unsigned short type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CUShort Word16 

Instances

Instances details
Storable CUShort # 
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Defined in Foreign.C.Types

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

Haskell type representing the C int type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CInt Int32 

Instances

Instances details
Storable CInt # 
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Bits CInt # 
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FiniteBits CInt # 
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Bounded CInt # 
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Enum CInt # 
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Num CInt # 
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Read CInt # 
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Integral CInt # 
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Real CInt # 
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Show CInt # 
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Eq CInt # 
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Methods

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

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

Ord CInt # 
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Defined in Foreign.C.Types

newtype CUInt Source #

Haskell type representing the C unsigned int type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CUInt Word32 

Instances

Instances details
Storable CUInt # 
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Bits CUInt # 
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FiniteBits CUInt # 
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Bounded CUInt # 
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Enum CUInt # 
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Num CUInt # 
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Read CUInt # 
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Integral CUInt # 
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Real CUInt # 
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Show CUInt # 
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Eq CUInt # 
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Methods

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

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

Ord CUInt # 
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newtype CLong Source #

Haskell type representing the C long type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CLong Int64 

Instances

Instances details
Storable CLong # 
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Bits CLong # 
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FiniteBits CLong # 
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Bounded CLong # 
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Enum CLong # 
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Num CLong # 
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Read CLong # 
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Integral CLong # 
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Real CLong # 
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Show CLong # 
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Eq CLong # 
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Methods

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

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

Ord CLong # 
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newtype CULong Source #

Haskell type representing the C unsigned long type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CULong Word64 

Instances

Instances details
Storable CULong # 
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Defined in Foreign.C.Types

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

Haskell type representing the C ptrdiff_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CPtrdiff Int64 

Instances

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

Haskell type representing the C size_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CSize Word64 

Instances

Instances details
Storable CSize # 
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Bits CSize # 
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FiniteBits CSize # 
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Bounded CSize # 
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Enum CSize # 
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Num CSize # 
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Read CSize # 
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Integral CSize # 
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Real CSize # 
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Show CSize # 
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Eq CSize # 
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Methods

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

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

Ord CSize # 
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newtype CWchar Source #

Haskell type representing the C wchar_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CWchar Int32 

Instances

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

Haskell type representing the C sig_atomic_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CSigAtomic Int32 

Instances

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

Haskell type representing the C long long type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CLLong Int64 

Instances

Instances details
Storable CLLong # 
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Defined in Foreign.C.Types

Bits CLLong # 
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FiniteBits CLLong # 
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Bounded CLLong # 
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Enum CLLong # 
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Num CLLong # 
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Read CLLong # 
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Integral CLLong # 
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Real CLLong # 
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Show CLLong # 
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Eq CLLong # 
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Ord CLLong # 
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newtype CULLong Source #

Haskell type representing the C unsigned long long type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CULLong Word64 

Instances

Instances details
Storable CULLong # 
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Defined in Foreign.C.Types

Bits CULLong # 
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FiniteBits CULLong # 
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Bounded CULLong # 
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Enum CULLong # 
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Num CULLong # 
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Read CULLong # 
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Integral CULLong # 
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Real CULLong # 
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Show CULLong # 
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Eq CULLong # 
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Ord CULLong # 
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newtype CBool Source #

Haskell type representing the C bool type. (The concrete types of Foreign.C.Types are platform-specific.)

Since: base-4.10.0.0

Constructors

CBool Word8 

Instances

Instances details
Storable CBool # 
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Bits CBool # 
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FiniteBits CBool # 
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Bounded CBool # 
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Enum CBool # 
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Num CBool # 
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Read CBool # 
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Integral CBool # 
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Real CBool # 
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Show CBool # 
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Eq CBool # 
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Methods

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

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

Ord CBool # 
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Defined in Foreign.C.Types

newtype CIntPtr Source #

Constructors

CIntPtr Int64 

Instances

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

Constructors

CUIntPtr Word64 

Instances

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

Constructors

CIntMax Int64 

Instances

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

Constructors

CUIntMax Word64 

Instances

Instances details
Storable CUIntMax # 
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Bits CUIntMax # 
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FiniteBits CUIntMax # 
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Bounded CUIntMax # 
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Enum CUIntMax # 
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Num CUIntMax # 
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Read CUIntMax # 
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Integral CUIntMax # 
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Real CUIntMax # 
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Show CUIntMax # 
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Eq CUIntMax # 
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Ord CUIntMax # 
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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. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CClock Int64 

Instances

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

Haskell type representing the C time_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CTime Int64 

Instances

Instances details
Storable CTime # 
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Enum CTime # 
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Num CTime # 
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Read CTime # 
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Real CTime # 
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Show CTime # 
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Eq CTime # 
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Methods

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

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

Ord CTime # 
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Defined in Foreign.C.Types

newtype CUSeconds Source #

Haskell type representing the C useconds_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Since: base-4.4.0.0

Constructors

CUSeconds Word32 

Instances

Instances details
Storable CUSeconds # 
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Enum CUSeconds # 
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Num CUSeconds # 
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Read CUSeconds # 
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Real CUSeconds # 
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Show CUSeconds # 
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Eq CUSeconds # 
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Ord CUSeconds # 
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newtype CSUSeconds Source #

Haskell type representing the C suseconds_t type. (The concrete types of Foreign.C.Types are platform-specific.)

Since: base-4.4.0.0

Constructors

CSUSeconds Int64 

Instances

Instances details
Storable CSUSeconds # 
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Defined in Foreign.C.Types

Enum CSUSeconds # 
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Num CSUSeconds # 
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Read CSUSeconds # 
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Real CSUSeconds # 
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Show CSUSeconds # 
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Eq CSUSeconds # 
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Ord CSUSeconds # 
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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. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CFloat Float 

Instances

Instances details
Storable CFloat # 
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Defined in Foreign.C.Types

Enum CFloat # 
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Floating CFloat # 
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RealFloat CFloat # 
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Num CFloat # 
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Read CFloat # 
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Fractional CFloat # 
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Defined in Foreign.C.Types

Real CFloat # 
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Defined in Foreign.C.Types

RealFrac CFloat # 
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Defined in Foreign.C.Types

Show CFloat # 
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Defined in Foreign.C.Types

Eq CFloat # 
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Defined in Foreign.C.Types

Ord CFloat # 
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Defined in Foreign.C.Types

newtype CDouble Source #

Haskell type representing the C double type. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CDouble Double 

Instances

Instances details
Storable CDouble # 
Instance details

Defined in Foreign.C.Types

Enum CDouble # 
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Defined in Foreign.C.Types

Floating CDouble # 
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Defined in Foreign.C.Types

RealFloat CDouble # 
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Defined in Foreign.C.Types

Num CDouble # 
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Defined in Foreign.C.Types

Read CDouble # 
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Defined in Foreign.C.Types

Fractional CDouble # 
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Defined in Foreign.C.Types

Real CDouble # 
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Defined in Foreign.C.Types

RealFrac CDouble # 
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Defined in Foreign.C.Types

Show CDouble # 
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Defined in Foreign.C.Types

Eq CDouble # 
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Defined in Foreign.C.Types

Ord CDouble # 
Instance details

Defined in Foreign.C.Types

Other types

data CFile Source #

Haskell type representing the C FILE type. (The concrete types of Foreign.C.Types are platform-specific.)

data CFpos Source #

Haskell type representing the C fpos_t type. (The concrete types of Foreign.C.Types are platform-specific.)

data CJmpBuf Source #

Haskell type representing the C jmp_buf type. (The concrete types of Foreign.C.Types are platform-specific.)