Documentation.SBV.Examples.Misc.Tuple

A basic tuple use case, also demonstrating regular expressions, strings, etc. This is a basic template for getting SBV to produce valid data for applications that require inputs that satisfy arbitrary criteria.

Documentation

type Dict a b = SBV [(a, b)]

A dictionary is a list of lookup values. Note that we store the type [(a, b)] as a symbolic value here, mixing sequences and tuples.

example :: IO [(String, Integer)]

Create a dictionary of length 5, such that each element has an string key and each value is the length of the key. We impose a few more constraints to make the output interesting. For instance, you might get:

 ghci> example
 [("nt_",3),("dHAk",4),("kzkk0",5),("mZxs9s",6),("c32'dPM",7)]

Depending on your version of z3, a different answer might be provided. Here, we check that it satisfies our length conditions:

>>> import Data.List (genericLength)
>>> example >>= \ex -> return (length ex == 5 && all (\(l, i) -> genericLength l == i) ex)
True