Struct tarantool::tuple::TupleIterator

pub struct TupleIterator { /* fields omitted */ }

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>(&mut self, fieldno: u32) -> Result<Option<T>, Error> where
    T: DeserializeOwned, 

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>(&mut self) -> Result<Option<T>, Error> where
    T: DeserializeOwned, 

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 Drop for TupleIterator

pub fn drop(&mut self)

Executes the destructor for this type.