Struct tarantool::tuple::TupleIterator

pub struct TupleIterator { /* private fields */ }

TupleIterator Tuple iterator

Implementations

impl TupleIterator

pub fn position(&self) -> u32

Return zero-based next position in iterator.

That is, this function return the field id of field that will be returned by the next call to box_tuple_next(it). Returned value is zero after initialization or rewind and box_tuple_field_count(Tuple) after the end of iteration.

pub fn rewind(&mut self)

Rewind iterator to the initial position.

pub fn seek<'t, T>(&'t mut self, fieldno: u32) -> Result<Option<T>>

where T: Decode<'t>,

Seek the Tuple iterator.

Requested fieldno returned by next call to box_tuple_next(it).

• fieldno - zero-based position in MsgPack array.

After call:

• box_tuple_position(it) == fieldno if returned value is not None
• box_tuple_position(it) == box_tuple_field_count(Tuple) if returned value is None.

pub fn next<'t, T>(&'t mut self) -> Result<Option<T>>

where T: Decode<'t>,

Return the next Tuple field from Tuple iterator.

Returns:

• None if i >= box_tuple_field_count(Tuple) or if field has a non primitive type
• field value otherwise

After call:

• box_tuple_position(it) == fieldno if returned value is not None
• box_tuple_position(it) == box_tuple_field_count(Tuple) if returned value is None.

pub fn update(&mut self)

Trait Implementations

impl Debug for TupleIterator

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for TupleIterator

fn drop(&mut self)

Executes the destructor for this type.