Struct mentat_transaction::query::QueryOutput

pub struct QueryOutput {
    pub spec: Rc<FindSpec>,
    pub results: QueryResults,
}

Fields

spec: Rc<FindSpec>

results: QueryResults

Methods

impl QueryOutput

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn empty_factory(spec: &FindSpec) -> Box<Fn() + 'static>

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn empty(spec: &Rc<FindSpec>) -> QueryOutput

pub fn from_constants(
    spec: &Rc<FindSpec>,
    bindings: BTreeMap<Variable, TypedValue>
) -> QueryResults

pub fn into_scalar(self) -> Result<Option<Binding>, ProjectorError>

pub fn into_coll(self) -> Result<Vec<Binding>, ProjectorError>

pub fn into_tuple<B>(self) -> Result<Option<B>, ProjectorError> where
    B: BindingTuple, 

Mentat tuple results can be expressed as multiple different data structures. Some structures are generic (vectors) and some are easier for pattern matching (fixed length tuples).

This is the moral equivalent of collect (and BindingTuple of FromIterator), but specialized to tuples of expected length.

pub fn into_rel(self) -> Result<RelResult<Binding>, ProjectorError>

Trait Implementations

impl From<QueryOutput> for QueryResults

fn from(o: QueryOutput) -> QueryResults

Performs the conversion.

impl Debug for QueryOutput

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Clone for QueryOutput

fn clone(&self) -> QueryOutput

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Eq for QueryOutput

impl PartialEq<QueryOutput> for QueryOutput

fn eq(&self, __arg_0: &QueryOutput) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &QueryOutput) -> bool

This method tests for !=.