order of GSignal callbacks

[vishnu pobox com]

Is there an easy way to write an assertion about the order of
callbacks?  For example, i have:

g_signal_connect (instance, "set-span", G_CALLBACK (cb1), mydata);

// and somewhere else in my code
g_signal_connect (instance, "set-span", G_CALLBACK (cb2), mydata);

i'm already using all of the signal execution stages (before, during,
after) for ordering.  i'm asking about checking ordering within a stage.
Something like:

g_assert (g_signal_handler_order_by_func
               (instance, "set-span", 0 /*detail*/, cb1, cb2) < 0);

Could i write such a function using the current API?

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