Function clingo_sys::clingo_symbol_is_positive

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

! Check if a function is positive (does not have a sign). ! ! @param[in] symbol the target symbol ! @param[out] positive 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