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