base-4.18.1.0: 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 Source # 
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Defined in Foreign.C.Types

Bits CChar Source # 
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Defined in Foreign.C.Types

FiniteBits CChar Source # 
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Defined in Foreign.C.Types

Bounded CChar Source # 
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Enum CChar Source # 
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Defined in Foreign.C.Types

Ix CChar Source # 
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Defined in Foreign.C.Types

Num CChar Source # 
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Defined in Foreign.C.Types

Read CChar Source # 
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Defined in Foreign.C.Types

Integral CChar Source # 
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Defined in Foreign.C.Types

Real CChar Source # 
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Defined in Foreign.C.Types

Show 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 #

Ord CChar Source # 
Instance details

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 Source # 
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Defined in Foreign.C.Types

Bits CSChar Source # 
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Defined in Foreign.C.Types

FiniteBits CSChar Source # 
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Defined in Foreign.C.Types

Bounded CSChar Source # 
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Defined in Foreign.C.Types

Enum CSChar Source # 
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Defined in Foreign.C.Types

Ix CSChar Source # 
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Defined in Foreign.C.Types

Num CSChar Source # 
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Defined in Foreign.C.Types

Read CSChar Source # 
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Defined in Foreign.C.Types

Integral CSChar Source # 
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Defined in Foreign.C.Types

Real CSChar Source # 
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Show CSChar Source # 
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Defined in Foreign.C.Types

Eq CSChar Source # 
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Ord CSChar Source # 
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Defined in Foreign.C.Types

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 Source # 
Instance details

Defined in Foreign.C.Types

Bits CUChar Source # 
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Defined in Foreign.C.Types

FiniteBits CUChar Source # 
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Defined in Foreign.C.Types

Bounded CUChar Source # 
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Defined in Foreign.C.Types

Enum CUChar Source # 
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Defined in Foreign.C.Types

Ix CUChar Source # 
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Defined in Foreign.C.Types

Num CUChar Source # 
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Defined in Foreign.C.Types

Read CUChar Source # 
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Defined in Foreign.C.Types

Integral CUChar Source # 
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Defined in Foreign.C.Types

Real CUChar Source # 
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Defined in Foreign.C.Types

Show CUChar Source # 
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Defined in Foreign.C.Types

Eq CUChar Source # 
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Defined in Foreign.C.Types

Ord CUChar Source # 
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Defined in Foreign.C.Types

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 Source # 
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Defined in Foreign.C.Types

Bits CShort Source # 
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Defined in Foreign.C.Types

FiniteBits CShort Source # 
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Defined in Foreign.C.Types

Bounded CShort Source # 
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Enum CShort Source # 
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Ix CShort Source # 
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Num CShort Source # 
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Read CShort Source # 
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Defined in Foreign.C.Types

Integral CShort Source # 
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Defined in Foreign.C.Types

Real CShort Source # 
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Show CShort Source # 
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Defined in Foreign.C.Types

Eq CShort Source # 
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Defined in Foreign.C.Types

Ord CShort Source # 
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Defined in Foreign.C.Types

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 Source # 
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Defined in Foreign.C.Types

Bits CUShort Source # 
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Defined in Foreign.C.Types

FiniteBits CUShort Source # 
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Defined in Foreign.C.Types

Bounded CUShort Source # 
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Defined in Foreign.C.Types

Enum CUShort Source # 
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Defined in Foreign.C.Types

Ix CUShort Source # 
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Defined in Foreign.C.Types

Num CUShort Source # 
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Defined in Foreign.C.Types

Read CUShort Source # 
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Defined in Foreign.C.Types

Integral CUShort Source # 
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Defined in Foreign.C.Types

Real CUShort Source # 
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Show CUShort Source # 
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Eq CUShort Source # 
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Ord CUShort Source # 
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Defined in Foreign.C.Types

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 Source # 
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Defined in Foreign.C.Types

Bits CInt Source # 
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Defined in Foreign.C.Types

FiniteBits CInt Source # 
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Defined in Foreign.C.Types

Bounded CInt Source # 
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Defined in Foreign.C.Types

Enum CInt Source # 
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Defined in Foreign.C.Types

Ix CInt Source # 
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Defined in Foreign.C.Types

Num CInt Source # 
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Read CInt Source # 
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Integral CInt Source # 
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Real CInt Source # 
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Show CInt Source # 
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Eq CInt Source # 
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Defined in Foreign.C.Types

Methods

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

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

Ord CInt Source # 
Instance details

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 Source # 
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Defined in Foreign.C.Types

Bits CUInt Source # 
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Defined in Foreign.C.Types

FiniteBits CUInt Source # 
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Bounded CUInt Source # 
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Defined in Foreign.C.Types

Enum CUInt Source # 
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Defined in Foreign.C.Types

Ix CUInt Source # 
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Defined in Foreign.C.Types

Num CUInt Source # 
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Read CUInt Source # 
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Defined in Foreign.C.Types

Integral CUInt Source # 
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Defined in Foreign.C.Types

Real CUInt Source # 
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Show CUInt Source # 
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Defined in Foreign.C.Types

Eq CUInt Source # 
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Defined in Foreign.C.Types

Methods

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

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

Ord CUInt Source # 
Instance details

Defined in Foreign.C.Types

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 Source # 
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Defined in Foreign.C.Types

Bits CLong Source # 
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Defined in Foreign.C.Types

FiniteBits CLong Source # 
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Defined in Foreign.C.Types

Bounded CLong Source # 
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Defined in Foreign.C.Types

Enum CLong Source # 
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Defined in Foreign.C.Types

Ix CLong Source # 
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Defined in Foreign.C.Types

Num CLong Source # 
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Defined in Foreign.C.Types

Read CLong Source # 
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Defined in Foreign.C.Types

Integral CLong Source # 
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Defined in Foreign.C.Types

Real CLong Source # 
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Show CLong Source # 
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Defined in Foreign.C.Types

Eq CLong Source # 
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Defined in Foreign.C.Types

Methods

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

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

Ord CLong Source # 
Instance details

Defined in Foreign.C.Types

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 Source # 
Instance details

Defined in Foreign.C.Types

Bits CULong Source # 
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Defined in Foreign.C.Types

FiniteBits CULong Source # 
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Defined in Foreign.C.Types

Bounded CULong Source # 
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Defined in Foreign.C.Types

Enum CULong Source # 
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Defined in Foreign.C.Types

Ix CULong Source # 
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Defined in Foreign.C.Types

Num CULong Source # 
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Defined in Foreign.C.Types

Read CULong Source # 
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Defined in Foreign.C.Types

Integral CULong Source # 
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Defined in Foreign.C.Types

Real CULong Source # 
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Show CULong Source # 
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Defined in Foreign.C.Types

Eq CULong Source # 
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Defined in Foreign.C.Types

Ord CULong Source # 
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Defined in Foreign.C.Types

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 Source # 
Instance details

Defined in Foreign.C.Types

Bits CPtrdiff Source # 
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Defined in Foreign.C.Types

FiniteBits CPtrdiff Source # 
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Defined in Foreign.C.Types

Bounded CPtrdiff Source # 
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Defined in Foreign.C.Types

Enum CPtrdiff Source # 
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Ix CPtrdiff Source # 
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Num CPtrdiff Source # 
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Read CPtrdiff Source # 
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Integral CPtrdiff Source # 
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Real CPtrdiff Source # 
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Show CPtrdiff Source # 
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Eq CPtrdiff Source # 
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Defined in Foreign.C.Types

Ord CPtrdiff Source # 
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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 Source # 
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Defined in Foreign.C.Types

Bits CSize Source # 
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Defined in Foreign.C.Types

FiniteBits CSize Source # 
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Defined in Foreign.C.Types

Bounded CSize Source # 
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Defined in Foreign.C.Types

Enum CSize Source # 
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Ix CSize Source # 
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Defined in Foreign.C.Types

Num CSize Source # 
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Defined in Foreign.C.Types

Read CSize Source # 
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Defined in Foreign.C.Types

Integral CSize Source # 
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Defined in Foreign.C.Types

Real CSize Source # 
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Defined in Foreign.C.Types

Show CSize Source # 
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Defined in Foreign.C.Types

Eq CSize Source # 
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Defined in Foreign.C.Types

Methods

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

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

Ord CSize Source # 
Instance details

Defined in Foreign.C.Types

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 Source # 
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Defined in Foreign.C.Types

Bits CWchar Source # 
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Defined in Foreign.C.Types

FiniteBits CWchar Source # 
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Defined in Foreign.C.Types

Bounded CWchar Source # 
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Defined in Foreign.C.Types

Enum CWchar Source # 
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Ix CWchar Source # 
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Defined in Foreign.C.Types

Num CWchar Source # 
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Read CWchar Source # 
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Integral CWchar Source # 
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Real CWchar Source # 
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Show CWchar Source # 
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Eq CWchar Source # 
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Ord CWchar Source # 
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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.) See Note [Lack of signals on wasm32-wasi].

Constructors

CSigAtomic Int32 

Instances

Instances details
Storable CSigAtomic Source # 
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Defined in Foreign.C.Types

Bits CSigAtomic Source # 
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Defined in Foreign.C.Types

FiniteBits CSigAtomic Source # 
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Defined in Foreign.C.Types

Bounded CSigAtomic Source # 
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Enum CSigAtomic Source # 
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Ix CSigAtomic Source # 
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Num CSigAtomic Source # 
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Read CSigAtomic Source # 
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Integral CSigAtomic Source # 
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Real CSigAtomic Source # 
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Show CSigAtomic Source # 
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Eq CSigAtomic Source # 
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Defined in Foreign.C.Types

Ord CSigAtomic Source # 
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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 Source # 
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Defined in Foreign.C.Types

Bits CLLong Source # 
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Defined in Foreign.C.Types

FiniteBits CLLong Source # 
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Defined in Foreign.C.Types

Bounded CLLong Source # 
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Defined in Foreign.C.Types

Enum CLLong Source # 
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Defined in Foreign.C.Types

Ix CLLong Source # 
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Defined in Foreign.C.Types

Num CLLong Source # 
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Defined in Foreign.C.Types

Read CLLong Source # 
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Defined in Foreign.C.Types

Integral CLLong Source # 
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Defined in Foreign.C.Types

Real CLLong Source # 
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Defined in Foreign.C.Types

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

Ord CLLong Source # 
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Defined in Foreign.C.Types

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 Source # 
Instance details

Defined in Foreign.C.Types

Bits CULLong Source # 
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Defined in Foreign.C.Types

FiniteBits CULLong Source # 
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Defined in Foreign.C.Types

Bounded CULLong Source # 
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Defined in Foreign.C.Types

Enum CULLong Source # 
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Defined in Foreign.C.Types

Ix CULLong Source # 
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Defined in Foreign.C.Types

Num CULLong Source # 
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Defined in Foreign.C.Types

Read CULLong Source # 
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Defined in Foreign.C.Types

Integral CULLong Source # 
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Defined in Foreign.C.Types

Real CULLong Source # 
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Defined in Foreign.C.Types

Show CULLong Source # 
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Eq CULLong Source # 
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Defined in Foreign.C.Types

Ord CULLong Source # 
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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 Source # 
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Defined in Foreign.C.Types

Bits CBool Source # 
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Defined in Foreign.C.Types

FiniteBits CBool Source # 
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Defined in Foreign.C.Types

Bounded CBool Source # 
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Enum CBool Source # 
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Ix CBool Source # 
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Num CBool Source # 
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Read CBool Source # 
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Integral CBool Source # 
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Real CBool Source # 
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Show 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 #

Ord CBool Source # 
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Defined in Foreign.C.Types

newtype CIntPtr Source #

Constructors

CIntPtr Int64 

Instances

Instances details
Storable CIntPtr Source # 
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Defined in Foreign.C.Types

Bits CIntPtr Source # 
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Defined in Foreign.C.Types

FiniteBits CIntPtr Source # 
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Defined in Foreign.C.Types

Bounded CIntPtr Source # 
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Enum CIntPtr Source # 
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Ix CIntPtr Source # 
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Num CIntPtr Source # 
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Read CIntPtr Source # 
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Integral CIntPtr Source # 
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Real CIntPtr Source # 
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Show CIntPtr Source # 
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Eq CIntPtr Source # 
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Ord CIntPtr Source # 
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newtype CUIntPtr Source #

Constructors

CUIntPtr Word64 

Instances

Instances details
Storable CUIntPtr Source # 
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Defined in Foreign.C.Types

Bits CUIntPtr Source # 
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Defined in Foreign.C.Types

FiniteBits CUIntPtr Source # 
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Defined in Foreign.C.Types

Bounded CUIntPtr Source # 
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Defined in Foreign.C.Types

Enum CUIntPtr Source # 
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Ix CUIntPtr Source # 
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Num CUIntPtr Source # 
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Read CUIntPtr Source # 
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Defined in Foreign.C.Types

Integral CUIntPtr Source # 
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Defined in Foreign.C.Types

Real CUIntPtr Source # 
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Show CUIntPtr Source # 
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Eq CUIntPtr Source # 
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Ord CUIntPtr Source # 
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newtype CIntMax Source #

Constructors

CIntMax Int64 

Instances

Instances details
Storable CIntMax Source # 
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Defined in Foreign.C.Types

Bits CIntMax Source # 
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Defined in Foreign.C.Types

FiniteBits CIntMax Source # 
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Defined in Foreign.C.Types

Bounded CIntMax Source # 
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Enum CIntMax Source # 
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Ix CIntMax Source # 
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Num CIntMax Source # 
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Read CIntMax Source # 
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Integral CIntMax Source # 
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Real CIntMax Source # 
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Show CIntMax Source # 
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Eq CIntMax Source # 
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Ord CIntMax Source # 
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Defined in Foreign.C.Types

newtype CUIntMax Source #

Constructors

CUIntMax Word64 

Instances

Instances details
Storable CUIntMax Source # 
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Defined in Foreign.C.Types

Bits CUIntMax Source # 
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Defined in Foreign.C.Types

FiniteBits CUIntMax Source # 
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Defined in Foreign.C.Types

Bounded CUIntMax Source # 
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Defined in Foreign.C.Types

Enum CUIntMax Source # 
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Defined in Foreign.C.Types

Ix CUIntMax Source # 
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Defined in Foreign.C.Types

Num CUIntMax Source # 
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Read CUIntMax Source # 
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Integral CUIntMax Source # 
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Defined in Foreign.C.Types

Real CUIntMax Source # 
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Show CUIntMax Source # 
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Eq CUIntMax Source # 
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Ord 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. (The concrete types of Foreign.C.Types are platform-specific.)

Constructors

CClock Int64 

Instances

Instances details
Storable CClock Source # 
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Defined in Foreign.C.Types

Enum CClock Source # 
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Num 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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Eq CClock Source # 
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Ord CClock Source # 
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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 Source # 
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Defined in Foreign.C.Types

Enum CTime Source # 
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Num 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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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 #

Ord CTime Source # 
Instance details

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 Source # 
Instance details

Defined in Foreign.C.Types

Enum CUSeconds Source # 
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Defined in Foreign.C.Types

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

Constructors

CFloat Float 

Instances

Instances details
Storable CFloat Source # 
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Enum CFloat Source # 
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Floating CFloat Source # 
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RealFloat CFloat Source # 
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Num CFloat Source # 
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Read CFloat Source # 
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Fractional CFloat Source # 
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Real CFloat Source # 
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RealFrac CFloat Source # 
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Show CFloat Source # 
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Eq CFloat Source # 
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Ord CFloat Source # 
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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 Source # 
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Enum CDouble Source # 
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Floating CDouble Source # 
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RealFloat CDouble Source # 
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Num CDouble Source # 
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Read CDouble Source # 
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Fractional CDouble Source # 
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Real CDouble Source # 
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RealFrac CDouble Source # 
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Show CDouble Source # 
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Eq CDouble Source # 
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Ord CDouble Source # 
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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.)