int functionp( mixed arg );
Return nonzero if `arg' is a function pointer and zero (0) otherwise. Function pointers are variables of type 'function' as indicated in the documentation for the type 'function', for example:
f = (: call_other, obj, func :);
The return value indicates the type of function pointer using the values given in the driver include file "include/function.h".
These values are bit values; the following flags may be added as well:
To test if a function variable is an efun pointer:
if (functionp(f) & FP_EFUN) ...
to test if it is an efun or simul_efun:
if (functionp(f) & (FP_EFUN | FP_SIMUL)) ...
Try (very hard) to call the function:
if (functionp(f) & FP_OWNER_DESTED) { if (functionp(f) & FP_NOT_BINDABLE) error("Function could not be rebound.\n"); f = bind(f, this_object()); } evaluate(f);
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