tuple-ops alternatives and similar packages
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tuple-th
Template Haskell functions for generating functions similar to those in Data.List for tuples of statically known size.
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README
tuple-ops
operations on n-ary tuples by manipulating via GHC.Generics. Current only uncons is implemented.
uncons
> uncons (1::Int)
(1,())
> uncons (1::Int,'a')
(1,'a')
> uncons (True,'a', "S")
(True,('a',"S"))
design rational
uncons initially targets to work with C interfaces generated from C2HS. For example, the following definition
{#fun MXSymbolInferShape as mxSymbolInferShapeImpl
{ id `SymbolHandle'
, id `MXUInt'
, withStringArray* `[String]'
, withIntegralArray* `[Int]'
, withIntegralArray* `[Int]'
, alloca- `MXUInt' peek*
, alloca- `Ptr MXUInt' peek*
, alloca- `Ptr (Ptr MXUInt)' peek*
, alloca- `MXUInt' peek*
, alloca- `Ptr MXUInt' peek*
, alloca- `Ptr (Ptr MXUInt)' peek*
, alloca- `MXUInt' peek*
, alloca- `Ptr MXUInt' peek*
, alloca- `Ptr (Ptr MXUInt)' peek*
, alloca- `Int' peekIntegral*
} -> `Int' #}
generates a function that returns (Int, MXUInt, Ptr MXUInt, Ptr (Ptr MXUInt), MXUInt, Ptr MXUInt, Ptr (Ptr MXUInt),
MXUInt, Ptr MXUInt, Ptr (Ptr MXUInt), Int), in which the first element is return code. By uncons it, we can extract the
return code, throwing an exception when an error is indicated, and return the rest part as result.
uncons also fits a function returning a return-code only. In this case, () is the result after extraction.
limits
only tuple of size up to 16 is supported.