Function clingo_sys::clingo_configuration_value_is_assigned

pub unsafe extern "C" fn clingo_configuration_value_is_assigned(
    configuration: *const clingo_configuration_t, 
    key: clingo_id_t, 
    assigned: *mut bool
) -> bool

! Check whether a entry has a value. ! ! @pre The @link clingo_configuration_type() type@endlink of the entry must be @ref ::clingo_configuration_type_value. ! @param[in] configuration the target configuration ! @param[in] key the key ! @param[out] assigned whether the entry has a value ! @return whether the call was successful