Struct Then 

pub struct Then { /* private fields */ }

Utility struct for the when-then-otherwise expression.

Represents the state of the expression after when(...).then(...) is called.

Implementations

impl Then

pub fn when<E>(self, condition: E) -> ChainedWhen

where E: Into<Expr>,

Attach a statement to the corresponding condition.

pub fn otherwise<E>(self, statement: E) -> Expr

where E: Into<Expr>,

Define a default for the when-then-otherwise expression.

pub fn serialize_compact_into( &self, writer: &mut dyn Write, ) -> Result<(), PolarsError>

Available on crate feature serde only.

Serialize with the compact format, not portable.

pub fn deserialize_compact_from( reader: &mut dyn Read, ) -> Result<Then, PolarsError>

Available on crate feature serde only.

Trait Implementations

impl Clone for Then

fn clone(&self) -> Then

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'de> Deserialize<'de> for Then

fn deserialize<__D>( __deserializer: __D, ) -> Result<Then, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Then

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.