C.7  Creating External Predicates in C

This function serves the same purpose as the ECLⁱPS^e built-in external/2:

int ec_external(dident pred, int(*fct)(), dident module)

Creates a predicate pred in the given module, whose C/C++ implementation is the function fct (see chapter 4 for how to write such functions). The module must exist. Return code is PSUCCEED or an error code.