Created
April 12, 2011 09:52
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The programmatic counter-part for "fun Mod:Fun/Arity"
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| -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). |
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. :-)
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Oooh, Kresten, you so nasty! ;-)