How do you connect to a functionally pure language API?

Question

I'm just curious to know how, in a purely functional language, you can connect to the API without introducing side effects?

+3

Esteval del toro May 09 '12 at 17:45

2 answers

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0

Guvante 09 '12 17:48

Don Stewart · Accepted Answer · 2012-05-09T18:00:44+0000

Purely functional languages such as Haskell support call functions in foreign languages through "external function interfaces . "

The question arises how to encode the types and behavior of a foreign language function into a purely functional language (for example, Haskell).

Two cases can be considered:

Pure functions

. : sin :: CDouble -> CDouble C.

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let state0 = initState
(v, state1) <- foreignFunction state0
(u, state2) <- foreignFunction state1
return (v,u)

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