v1::shared_state< T > Class Template Reference

#include <hikogui/observer/shared_state.hpp>

Public Types
using	value_type = T

Public Member Functions
constexpr	shared_state (shared_state const &) noexcept=default
constexpr	shared_state (shared_state &&) noexcept=default
constexpr shared_state &	operator= (shared_state const &) noexcept=default
constexpr shared_state &	operator= (shared_state &&) noexcept=default
template<typename... Args>
constexpr	shared_state (Args &&...args) noexcept
	Construct the shared state and initialize the value.
observer< value_type >	observer () const &noexcept
auto	sub (auto const &index) const &noexcept
	Get a observer to a sub-object of value accessed by the index operator.
template<fixed_string Name>
auto	sub () const &noexcept
	Get a observer to a member variable of the value.

Detailed Description

template<typename T>
class v1::shared_state< T >

Shared state of an application.

The shared state of an application that can be manipulated by the GUI, preference and other systems.

A observer selects a member or indexed element from the shared state, or from another observer. You can .read() or .copy() the value pointed to by the observer to read and manipulate the shared-data.

Both .read() and .copy() take the full shared-state as a whole not allowing other threads to have write access to this reference or copy. A copy will be automatically committed, or may be aborted as well.

lifetime:

• The lifetime of observer will extend the lifetime of shared_state.
• The lifetime of observer::proxy must be within the lifetime of observer.
• The lifetime of observer::const_proxy must be within the lifetime of observer.
• Although observer are created from another observer they internally do not refer to each other so their lifetime are not connected.

Template Parameters

T	type used as the shared state.

Constructor & Destructor Documentation

shared_state()

template<typename T >

template<typename... Args>

constexpr v1::shared_state< T >::shared_state ( Args &&... args )

inlineconstexprnoexcept

Construct the shared state and initialize the value.

Parameters

args	The arguments passed to the constructor of the value.

Member Function Documentation

sub() [1/2]

template<typename T >

template<fixed_string Name>

auto v1::shared_state< T >::sub ( ) const &

inlinenoexcept

Get a observer to a member variable of the value.

Note

This requires the specialization of hi::selector<value_type>.

Template Parameters

Name	the name of the member variable of the value.

Returns

The new observer pointing to the member variable of the value

sub() [2/2]

template<typename T >

auto v1::shared_state< T >::sub ( auto const & index ) const &

inlinenoexcept

Get a observer to a sub-object of value accessed by the index operator.

Parameters

index

The index used with the index operator of the value.

Returns

The new observer pointing to a sub-object of the value.

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

• hikogui/src/hikogui/observer/shared_state.hpp