Function clingo_sys::clingo_symbol_is_negative

pub unsafe extern "C" fn clingo_symbol_is_negative(
    symbol: clingo_symbol_t, 
    negative: *mut bool
) -> bool

Check if a function is negative (has a sign).

@param[in] symbol the target symbol @param[out] negative the result @return whether the call was successful; might set one of the following error codes:

• ::clingo_error_runtime if symbol is not of type ::clingo_symbol_type_function