live_cells::store_changes_only_cell_state< C > Class Template Reference

A store_cell_state that only notifies the observers of the cell if the new value of the cell is not equal to its previous value. More...

#include <store_cell.hpp>

Inheritance diagram for live_cells::store_changes_only_cell_state< C >:

Collaboration diagram for live_cells::store_changes_only_cell_state< C >:

Additional Inherited Members
Public Types inherited from live_cells::compute_cell_state< store_cell_compute_state< C > >
typedef std::invoke_result_t< C, observer::ref >	value_type
	Shorthand for computed value type.
Public Types inherited from live_cells::cell_state
typedef std::shared_ptr< cell_state >	ref
	Shared pointer to a cell_state.
Public Types inherited from live_cells::observer
typedef std::shared_ptr< observer >	ref
	Shared pointer to an observer.
Public Member Functions inherited from live_cells::changes_only_cell_state< store_cell_state< C > >
void	will_update (const key_ref &k) override
void	update (const key_ref &k, bool changed) override
Public Member Functions inherited from live_cells::store_cell_state< C >
	store_cell_state (key_ref k, C arg)
	Create a store_cell state.
Public Member Functions inherited from live_cells::compute_cell_state< store_cell_compute_state< C > >
	compute_cell_state (key_ref k, Args &&... args)
	Create a computed cell state.
value_type	value ()
	Retrieve the latest cached value.
Public Member Functions inherited from live_cells::cell_state
	cell_state (key_ref k)
	Create a cell state with a given key.
cell_state &	operator= (const cell_state &other)=delete
virtual void	add_observer (observer::ref o)
	Add an observer to the cell's set of observers.
virtual void	remove_observer (observer::ref o)
	Remove an observer from the cell's set of observers.
virtual void	notify_will_update ()
	Notify the observers that the cell's value will change.
virtual void	notify_update (bool did_change=true)
	Notify the observers that the cell's value has changed.
Protected Types inherited from live_cells::store_cell_state< C >
typedef C::value_type	value_type
Protected Member Functions inherited from live_cells::store_cell_state< C >
void	init () override
	Called before the first observer is added.
void	pause () override
	Called after the last observer is removed.
Protected Member Functions inherited from live_cells::compute_cell_state< store_cell_compute_state< C > >
std::shared_ptr< observer >	observer_ptr ()
	Get an observer::ref for this, that can be passed to add_observer and remove_observer of Cell.
void	will_update (const key_ref &k) override
	Notifies this observer that the value of the Cell identified by k is going to change.
void	update (const key_ref &k, bool changed) override
	Notifies this observer that the value of the Cell identified by k has changed.
Protected Member Functions inherited from live_cells::cell_state
bool	is_active () const
	Does the cell have at least one observer?
Protected Member Functions inherited from live_cells::observer_cell_state
void	init_observer_state ()
	Initialize the cell observation state.
void	pause_observer_state ()
	Pause the cell observation state.
void	handle_will_update (const std::invocable auto &notify_will_update)
	Handle a observer::will_update call.
void	handle_will_update (const std::invocable auto &pre_update, const std::invocable auto &notify_will_update)
	Handle a observer::will_update call.
void	handle_update (bool changed, const std::invocable< bool > auto &notify_update)
	Handle an observer::update call.
void	handle_update (bool changed, const std::invocable auto &did_change, const std::invocable< bool > auto &notify_update, const std::invocable auto &post_update)
	Handle an observer::update call.
Protected Attributes inherited from live_cells::compute_cell_state< store_cell_compute_state< C > >
C	compute
	Compute value function.
Protected Attributes inherited from live_cells::cell_state
key_ref	key_
	Key identifying the cell corresponding to this state.
std::unordered_map< observer::ref, std::size_t >	observers
	The set of observers observing changes to the values in the cell corresponding to this state.
Protected Attributes inherited from live_cells::observer_cell_state
bool	stale = true
	Does the value have to be recomputed?
bool	updating = false
	Are the argument cells in the process of updating their values?

Detailed Description

template<Cell C>
class live_cells::store_changes_only_cell_state< C >

A store_cell_state that only notifies the observers of the cell if the new value of the cell is not equal to its previous value.

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The documentation for this class was generated from the following file:

• src/store_cell.hpp