3 -behavior(hope_gen_monad).
28 -spec put(A, fun((A) -> boolean())) ->
33 -spec get(t(A), Default :: A) ->
35 get({some, X}, _) -> X;
43 -spec return(A, fun((A) -> boolean())) ->
45 return(X, Condition) ->
51 -spec map(t(A), fun((A) -> (B))) ->
53 map({some, X}, F) -> {some, F(X)};
54 map(none , _) -> none.
56 -spec iter(t(A), fun((A) -> (ok))) ->
58 iter({some, X}, F) -> ok = F(X);
61 -spec pipe([fun((A) -> t(B))], A) ->
68 ; {some, Y} -> pipe(Fs, Y)
71 -spec of_result(hope_result:t(A, _B)) ->
73 of_result({ok, X}) -> {some, X};
74 of_result({error, _}) -> none.
76 -spec of_undefined(undefined | A) ->
78 of_undefined(undefined) -> none;
79 of_undefined(X) -> {some, X}.