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