ghc-internal-9.1001.0: 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

GHC.Internal.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
Bits CChar Source # 
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Defined in GHC.Internal.Foreign.C.Types

FiniteBits CChar Source # 
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Bounded CChar Source # 
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Enum CChar Source # 
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Storable CChar Source # 
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Ix CChar Source # 
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Num CChar Source # 
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Read CChar Source # 
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Integral CChar Source # 
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Real CChar Source # 
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Show CChar Source # 
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Eq CChar Source # 
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Methods

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

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

Ord CChar Source # 
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Defined in GHC.Internal.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
Bits CSChar Source # 
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FiniteBits CSChar Source # 
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Bounded CSChar Source # 
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Enum CSChar Source # 
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Storable CSChar Source # 
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Ix CSChar Source # 
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Num CSChar Source # 
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Read CSChar Source # 
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Integral CSChar Source # 
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Real CSChar Source # 
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Show CSChar Source # 
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Eq CSChar Source # 
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Ord CSChar Source # 
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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
Bits CUChar Source # 
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FiniteBits CUChar Source # 
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Bounded CUChar Source # 
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Enum CUChar Source # 
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Storable CUChar Source # 
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Ix CUChar Source # 
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Num CUChar Source # 
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Read CUChar Source # 
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Integral CUChar Source # 
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Real CUChar Source # 
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Show CUChar Source # 
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Eq CUChar Source # 
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Ord CUChar Source # 
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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
Bits CShort Source # 
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FiniteBits CShort Source # 
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Bounded CShort Source # 
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Enum CShort Source # 
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Storable 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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Integral CShort Source # 
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Real CShort Source # 
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Show CShort Source # 
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Eq CShort Source # 
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Ord CShort Source # 
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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
Bits CUShort Source # 
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FiniteBits CUShort Source # 
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Bounded CUShort Source # 
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Enum CUShort Source # 
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Storable CUShort Source # 
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Ix CUShort Source # 
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Num CUShort Source # 
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Read CUShort Source # 
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Integral CUShort Source # 
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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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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
Bits CInt Source # 
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FiniteBits CInt Source # 
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Bounded CInt Source # 
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Enum CInt Source # 
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Storable CInt Source # 
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Ix CInt Source # 
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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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Methods

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

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

Ord CInt Source # 
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Defined in GHC.Internal.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
Bits CUInt Source # 
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FiniteBits CUInt Source # 
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Bounded CUInt Source # 
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Enum CUInt Source # 
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Storable CUInt Source # 
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Ix CUInt Source # 
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Num CUInt Source # 
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Read CUInt Source # 
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Integral CUInt Source # 
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Real CUInt Source # 
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Show CUInt Source # 
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Eq CUInt Source # 
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Methods

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

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

Ord CUInt Source # 
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Defined in GHC.Internal.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
Bits CLong Source # 
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FiniteBits CLong Source # 
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Bounded CLong Source # 
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Enum CLong Source # 
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Storable CLong Source # 
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Ix CLong Source # 
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Num CLong Source # 
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Read CLong Source # 
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Integral CLong Source # 
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Real CLong Source # 
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Show CLong Source # 
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Eq CLong Source # 
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Methods

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

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

Ord CLong Source # 
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Defined in GHC.Internal.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
Bits CULong Source # 
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FiniteBits CULong Source # 
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Bounded CULong Source # 
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Enum CULong Source # 
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Storable CULong Source # 
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Ix CULong Source # 
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Num CULong Source # 
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Read CULong Source # 
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Integral CULong Source # 
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Real CULong Source # 
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Show CULong Source # 
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Eq CULong Source # 
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Ord CULong Source # 
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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
Bits CPtrdiff Source # 
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FiniteBits CPtrdiff Source # 
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Bounded CPtrdiff Source # 
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Enum CPtrdiff Source # 
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Storable 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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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
Bits CSize Source # 
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FiniteBits CSize Source # 
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Bounded CSize Source # 
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Enum CSize Source # 
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Storable CSize Source # 
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Ix CSize Source # 
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Num CSize Source # 
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Read CSize Source # 
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Integral CSize Source # 
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Real CSize Source # 
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Show CSize Source # 
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Eq CSize Source # 
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Methods

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

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

Ord CSize Source # 
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Defined in GHC.Internal.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
Bits CWchar Source # 
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FiniteBits CWchar Source # 
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Bounded CWchar Source # 
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Enum CWchar Source # 
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Storable CWchar Source # 
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Ix CWchar Source # 
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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
Bits CSigAtomic Source # 
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FiniteBits CSigAtomic Source # 
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Bounded CSigAtomic Source # 
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Enum CSigAtomic Source # 
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Storable 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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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
Bits CLLong Source # 
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FiniteBits CLLong Source # 
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Bounded CLLong Source # 
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Enum CLLong Source # 
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Storable CLLong Source # 
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Ix CLLong Source # 
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Num CLLong Source # 
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Read CLLong Source # 
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Integral CLLong Source # 
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Real CLLong Source # 
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Show CLLong Source # 
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Eq CLLong Source # 
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Ord CLLong Source # 
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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
Bits CULLong Source # 
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FiniteBits CULLong Source # 
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Bounded CULLong Source # 
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Enum CULLong Source # 
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Storable CULLong Source # 
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Ix CULLong Source # 
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Num CULLong Source # 
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Read CULLong Source # 
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Integral CULLong Source # 
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Real CULLong Source # 
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Show CULLong Source # 
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Eq CULLong Source # 
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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
Bits CBool Source # 
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FiniteBits CBool Source # 
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Bounded CBool Source # 
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Enum CBool Source # 
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Storable 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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Methods

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

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

Ord CBool Source # 
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newtype CIntPtr Source #

Constructors

CIntPtr Int64 

Instances

Instances details
Bits CIntPtr Source # 
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FiniteBits CIntPtr Source # 
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Bounded CIntPtr Source # 
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Enum CIntPtr Source # 
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Storable 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
Bits CUIntPtr Source # 
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FiniteBits CUIntPtr Source # 
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Bounded CUIntPtr Source # 
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Enum CUIntPtr Source # 
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Storable 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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Integral CUIntPtr Source # 
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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
Bits CIntMax Source # 
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FiniteBits CIntMax Source # 
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Bounded CIntMax Source # 
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Enum CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Storable CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ix CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Num CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Read CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Integral CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Real CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Show CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Eq CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ord CIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

newtype CUIntMax Source #

Constructors

CUIntMax Word64 

Instances

Instances details
Bits CUIntMax Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types

FiniteBits CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Bounded CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Enum CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Storable CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ix CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Num CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Read CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Integral CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Real CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Show CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Eq CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ord CUIntMax Source # 
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Defined in GHC.Internal.Foreign.C.Types

GHC.Internal.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
Enum CClock Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Storable CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Num CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Read CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Real CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Show CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Eq CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ord CClock Source # 
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Defined in GHC.Internal.Foreign.C.Types

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
Enum CTime Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Storable CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Num CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Read CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Real CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Show CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Eq CTime Source # 
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Defined in GHC.Internal.Foreign.C.Types

Methods

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

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

Ord CTime Source # 
Instance details

Defined in GHC.Internal.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
Enum CUSeconds Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Storable CUSeconds Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types

Num CUSeconds Source # 
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Defined in GHC.Internal.Foreign.C.Types

Read CUSeconds Source # 
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Defined in GHC.Internal.Foreign.C.Types

Real CUSeconds Source # 
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Defined in GHC.Internal.Foreign.C.Types

Show CUSeconds Source # 
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Defined in GHC.Internal.Foreign.C.Types

Eq CUSeconds Source # 
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Defined in GHC.Internal.Foreign.C.Types

Ord CUSeconds Source # 
Instance details

Defined in GHC.Internal.Foreign.C.Types