3 -behavior(hope_gen_monad).
10 % Generic monad interface
15 % Specific to hope_option:t()
33 -spec put(A, fun((A) -> boolean())) ->
38 -spec get(t(A), Default :: A) ->
40 get({some, X}, _) -> X;
48 -spec return(A, fun((A) -> boolean())) ->
50 return(X, Condition) ->
56 -spec map(t(A), fun((A) -> (B))) ->
58 map({some, X}, F) -> {some, F(X)};
59 map(none , _) -> none.
61 -spec iter(t(A), fun((A) -> (any()))) ->
69 -spec pipe([fun((A) -> t(B))], A) ->
76 ; {some, Y} -> pipe(Fs, Y)
79 -spec of_result(hope_result:t(A, _B)) ->
81 of_result({ok, X}) -> {some, X};
82 of_result({error, _}) -> none.
84 -spec of_undefined(undefined | A) ->
86 of_undefined(undefined) -> none;
87 of_undefined(X) -> {some, X}.
89 -spec to_undefined(t(A)) ->
91 to_undefined(none) -> undefined;
92 to_undefined({some, X}) -> X.
94 -spec validate(t(A), fun((A) -> boolean())) ->
98 validate({some, X}=T, F) ->