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What does the question mark in ?MODULE (which can be seen in all generated code by Mochiweb make command) mean?
-export([start/1, stop/0, loop/2]).
start(Options) ->
{DocRoot, Options1} = get_option(docroot, Options),
Loop = fun (Req) ->
?MODULE:loop(Req, DocRoot)
end,
mochiweb_http:start([{name, ?MODULE}, {loop, Loop} | Options1]).
stop() ->
mochiweb_http:stop(?MODULE).
loop(Req, DocRoot) ->
...
It denotes a preprocessor macro.
?MODULEis one of the predefined macro constants that expand to current module’s name.