Dialog system : pausing script and resume on player's answer

Hi,

I'm trying to create a dialog system for a game with the possibility
of choosing between different answers (there might be more than 2
answers)

=========================
local speech = createSpeech("Welcome to the tutorial ! Do you want to
skip it ?");
speech:addAnswer('Yes',1);
speech:addAnswer('No',0);

-- answerValue could be either 1 or 0
local answerValue = MainState:showMessage(speech);
if(answerValue == 1) then
      -- Player wants to skip tutorial
else
      -- we create new dialogs ....
end
=========================

showMessage() is a C++ function that changes my C++ state machine to
the dialog system. I would like showMessage() to pause the script when
called. I would like the script to resume when the player answers the
question and return his answer (an integer, retrieved in the example
in "answerValue") possibly from a different function than
showMessage() (C++ function onAnswer() for example).

Then on the lua side, I will create  matching dialogs.

What is the best way to achieve this (if possible with luabind) ? I've
tried using the yield policy:
    luabind::class_<CSinglePlayerState>("CSinglePlayerState")
        .def("showMessage",&CSinglePlayerState::showMessage, yield)
        ,

but I get the error "Attempt to yield across metamethod". Do I
absolutely need to create a thread ? (I would like to keep things
simple).


Let me know if things are unclear or if this would be best asked on a lua forum.

Matt

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