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Monads, Functors and Do-Notation for Erlang

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do src classes do_semigroup.erl
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src/classes/do_semigroup.erl 

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

%%% @doc The Semigroup Type Class.

%%% @end

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



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

-module(do_semigroup).



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

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

-export(?API).

-ignore_xref(?API).



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

-include("do_types.hrl").

-include("do_internal.hrl").



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

-callback append(semigroup(A), semigroup(A)) -> semigroup(A).



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

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

append(S1, S2) -> ?Mod(S1):append(S1, S2).