Struct MessageStack 

pub struct MessageStack { /* private fields */ }

A type-erased message stack

This is a stack over Erased, with some downcasting methods. It is a component of EventCx and usually only used through that, thus the interface here is incomplete.

Implementations

impl MessageStack

pub fn new() -> Self

Construct an empty stack

pub fn has_any(&self) -> bool

True if the stack has messages available

pub fn try_pop<M: Debug + 'static>(&mut self) -> Option<M>

Try popping the last message from the stack with the given type

This method may be called from Events::handle_messages.

pub fn try_observe<M: Debug + 'static>(&self) -> Option<&M>

Try observing the last message on the stack without popping

This method may be called from Events::handle_messages.

pub fn try_debug(&self) -> Option<&dyn Debug>

Try getting a debug representation of the last message on the stack

Note: this method will always return None in release builds. This may or may not change in future versions.

Trait Implementations

impl Debug for MessageStack

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

Formats the value using the given formatter.

impl Default for MessageStack

fn default() -> MessageStack

Returns the “default value” for a type.

impl Drop for MessageStack

fn drop(&mut self)

Executes the destructor for this type.