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extern int x1f4_pfix_lxtrap
    (void *lxtrap, void *context,
     int (*get)(void *, int, int, const struct x1f4_operator_type **));

The x1f4_pfix_lxtrap function sets the prefix unary operator converters provider for the lxtrap trap library as get, the converter look up method, and context, the converter look up context. A NULL value for get disables the prefix unary operator converter look up.

The function returns 0.