This module is part of the language-dependent part of the Foreign Function Interface (FFI) - for the language-independent part, see Section 4.9. It defines Haskell types that can hold the primitive types of C and can directly be used in foreign import and export declarations.
Every type has a constructor of the same name, which is currently exported, too. Given the large set of instances for each type, it is not clear if access to the concrete representation is really necessary. Some experience is needed before a final decision can be made in this respect.
The following integral types have instances for the classes Eq, Ord, Num, Read, Show, Enum, Typeable, Storable, Bounded, Real, Integral, and Bits:
newtype CChar -- char newtype CSChar -- signed char newtype CUChar -- unsigned char newtype CShort -- short newtype CUShort -- unsigned short newtype CInt -- int newtype CUInt -- unsigned int newtype CLong -- long newtype CULong -- unsigned long newtype CLLong -- long long newtype CULLong -- unsigned long long
The following floating types have instances for the classes Eq, Ord, Num, Read, Show, Enum, Typeable, Storable, Real, Fractional, Floating, RealFrac, and RealFloat:
newtype CFloat -- float newtype CDouble -- double newtype CLDouble -- long double