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using System; | |
namespace Funcs { | |
public static class Funcs { | |
public static Func<A, C> Select<A, B, C>(this Func<A, B> f, Func<B, C> g) { | |
return a => g(f(a)); | |
} | |
public static Func<C, B> SelectMany<A, B, C>(this Func<C, A> f, Func<A, Func<C, B>> g) { | |
return a => g(f(a))(a); | |
} | |
public static Func<C, D> SelectMany<A, B, C, D>(this Func<C, A> f, Func<A, Func<C, B>> p, Func<A, B, D> k) { | |
return SelectMany<A, D, C>(f, b => Select<C, B, D>(p(b), x => k(b, x))); | |
} | |
} | |
class UseFunc { | |
Func< | |
Func<A, B, C> | |
, Func<int, A> | |
, Func<int, B> | |
, Func<int, C> | |
> | |
use<A, B, C>() { | |
return | |
(f, a, b) => | |
from aa in a | |
from bb in b | |
select f(aa, bb); | |
} | |
} | |
} |
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