,可以通过以下步骤来实现:
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
import GHC.TypeLits
type family FindNextFactor (n :: Nat) (m :: Nat) :: Nat where
FindNextFactor n m = If (Mod n m == 0) m (FindNextFactor n (m + 1))
findNextFactor :: KnownNat n => Proxy n -> Integer
findNextFactor proxy = natVal proxy + 1 + findNextFactor' (natVal proxy + 1)
where
findNextFactor' :: Integer -> Integer
findNextFactor' m = case someNatVal m of
Just (SomeNat proxy') -> case sameNat proxy proxy' of
Just Refl -> findNextFactor' (m + 1)
Nothing -> case sameNat proxy (FindNextFactor (natVal proxy) 2) of
Just Refl -> m
Nothing -> findNextFactor' (m + 1)
Nothing -> findNextFactor' (m + 1)
这是一个简单的示例,用于演示如何在给定类型级别的起始KnownNat的情况下查找KnownNat的下一个因子。实际应用中,可能需要根据具体需求进行更复杂的处理和优化。
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