The programmatic counter-part for "fun Mod:Fun/Arity"

funhack.erl

-module(funhack).
-export([mkfun/3]).

%% @doc
%%  The programmatic counter-part for `fun Mod:Fun/Arity'.
%%
%%  Erlang syntax does not allow usage of the `fun' syntax, 
%%  where Mod, Fun and Arity are variables; they need to be
%%  atom, atom, integer.  This little hack lets you avoid
%%  writing `fun(A1,A2,A3...) -> Mod:Fun(A1,A2,A3,...) end'.
%% @end
mkfun(Mod,Fun,Arity) ->
    ModBin = atom_to_binary(Mod, latin1),
    FunBin = atom_to_binary(Fun, latin1),
    Binary = <<131,113,
              100,0,(byte_size(ModBin)),ModBin/binary,
              100,0,(byte_size(FunBin)),FunBin/binary,
              97,Arity>>,
    binary_to_term(Binary).

Oooh, Kresten, you so nasty! ;-)

Nice hack. btw: what's wrong with using erlang:make_fun/3?

Darn, even Erjang implements it. Stupid me; but it is not documented!

No, it's really meant as a compiler intrinsic function, and should not be used by mere mortals. It might be preferable to the binary_to_term-hack, though, if you really really need it. :-)