Struct zng::var::AnyWhenVarBuilder

pub struct AnyWhenVarBuilder { /* private fields */ }

Manually build a ArcWhenVar<T> from type erased parts.

Implementations

impl AnyWhenVarBuilder

pub fn new<O>(default: impl IntoVar<O>) -> AnyWhenVarBuilder

where O: VarValue,

Start building with only the default value.

pub fn new_any(default: Box<dyn AnyVar>) -> AnyWhenVarBuilder

Start building with already boxed var.

pub fn from_var<O>(var: &ContextualizedVar<O>) -> AnyWhenVarBuilder

where O: VarValue,

Create a builder from the parts of a formed when_var!.

Panics

Panics if called not called with a contextualized var produced by when_var!.

pub fn condition_count(&self) -> usize

Returns the number of conditions set.

pub fn set_default<O>(&mut self, default: impl IntoVar<O>)

where O: VarValue,

Set/replace the default value.

pub fn set_default_any(&mut self, default: Box<dyn AnyVar>)

Set/replace the default value with an already typed erased var.

pub fn push<C, O, V>(&mut self, condition: C, value: V)

where C: Var<bool>, O: VarValue, V: IntoVar<O>,

Push a when condition.

pub fn push_any( &mut self, condition: Box<dyn VarBoxed<bool>>, value: Box<dyn AnyVar>, )

Push a when condition already boxed and type erased.

pub fn replace_extend(&mut self, other: &AnyWhenVarBuilder)

Replace the default value if other has default and extend the conditions with clones of other.

pub fn extend(&mut self, other: &AnyWhenVarBuilder)

Extend the conditions with clones of other.

pub fn build<T>(&self) -> Option<Box<dyn VarBoxed<T>>>

where T: VarValue,

Build the when var if all value variables are of type BoxedVar<T>.

Trait Implementations

impl Clone for AnyWhenVarBuilder

fn clone(&self) -> AnyWhenVarBuilder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AnyWhenVarBuilder

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

Formats the value using the given formatter.