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3.21.3.18 x1f4_peek_expression

extern int x1f4_peek_expression
    (void *x1f4_expression, void *data,
     int (*this)(void *, const struct x1f4_function_type *));

The x1f4_peek_expression function lists the symbolic function occurences in the x1f4_expression parsed expression representation by calling the this method with the function listing data context and the symbolic function definition as parameters for each variable occurence, for as long as this returns 0.

See struct x1f4_function_type.

The function returns 0 if this was never called or never returned non zero, the first (and only) non zero return of this otherwise.