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Monads, Functors and Do-Notation for Erlang

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do src classes do_applicative.erl
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src/classes/do_applicative.erl 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%% @doc The Applicative Type Class.

%%% @end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%_* Module declaration ======================================================

-module(do_applicative).



%%%_* Exports =================================================================

-define(API, [liftA2/2]).

-export(?API).

-ignore_xref(?API).



%%%_* Includes ================================================================

-include("do_types.hrl").

-include("do_internal.hrl").



%%%_* Callbacks ===============================================================

-callback pure(A) -> applicative(A).

-callback liftA2(applicative(fn(A, B)), applicative(A)) -> applicative(B).



%%%_* Code ====================================================================

%%%_* API ---------------------------------------------------------------------

-spec liftA2(applicative(fn(A, B)), applicative(A)) -> applicative(B).

liftA2(A1, A2) -> ?Mod(A1):liftA2(A1, A2).