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Monads, Functors and Do-Notation for Erlang

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do src instances do_fn.erl
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src/instances/do_fn.erl 

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

%%% @doc The Fun Functor.

%%% @end

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



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

-module(do_fn).



-behaviour(do_functor).



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

-export([fmap/2]).



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

-include("do_internal.hrl").

-include("do_types.hrl").



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

-spec fmap(fn(B, C), fn(A, B)) -> fn(A, C).

fmap(F, Fun) when ?isF1(F), ?isF1(Fun) -> fun(Arg) -> F(Fun(Arg)) end.