obs::GlobalVar< T > Class Template Reference

Wrapper for global variable, supports notification events when value changes. More...

#include <global_var.h>

Inheritance diagram for obs::GlobalVar< T >:

Public Member Functions
	GlobalVar (T *ptr)
void	Set (const T &arg)
T	Get ()
Public Member Functions inherited from obs::Observable
	Observable (const std::string &_key)
	Initiate an object which can apply Notify() and Listen() to given key.
	Observable (const KeyProvider &kp)
	Initiate an object which can apply Notify() and Listen() to given key.
virtual void	Notify ()
	Notify all listeners to configured key about variable change.
virtual void	Notify (const std::shared_ptr< const void > &p)
	Notify all listeners to configured key about variable change.
bool	Unlisten (wxEvtHandler *listener, wxEventType ev)
	Remove window listening to ev from list of listeners.
std::string	GetKey () const override
	Return the key given to the constructor.

Additional Inherited Members
Public Attributes inherited from obs::Observable
const std::string	key
	The key used to create and clone.
Protected Member Functions inherited from obs::Observable
void	Notify (const std::shared_ptr< const void > &ptr, const std::string &s, int num, void *client_data)
	Notify all listeners: send them a 'type' ObservedEvt message as defined by Listen() with optional data available using GetString(), GetClientData(), GetInt() and/or GetSharedPtr()
void	Notify (const std::string &s, void *client_data)
	Notify all listeners: send them a 'type' ObservedEvt message as defined by Listen() with optional data available using GetString(), and/or GetClientData().

Detailed Description

template<typename T>
class obs::GlobalVar< T >

Wrapper for global variable, supports notification events when value changes.

Client usage, writing a value + notifying listeners

GlobalVar<wxString> compat_os(&g_compatOS);
compat_os.Set("ubuntu-gtk3-x86_64");

Client usage, modifying a value + notifying listeners:

GlobalVar<wxString> plugin_array_var(&plugin_array);
plugin_array.Add(new_pic);
plugin_array_var.Notify();

Client usage, listening to value changes:

class Foo: public wxEvtHandler {
public:
  Foo(...) {
    GlobalVar<wxString> compat_os(&g_compatOS);
    auto action = [](wxCommandEvent&) { cout << "value has changed"; };
    compat_os_listener.Init(compat_os, action);
  }
private:
  obs::Listener compat_os_listener;
  ...
}

Definition at line 69 of file global_var.h.

Constructor & Destructor Documentation

GlobalVar()

template<typename T >

obs::GlobalVar< T >::GlobalVar ( T *  ptr )

inlineexplicit

Definition at line 71 of file global_var.h.

Member Function Documentation

Get()

template<typename T >

T obs::GlobalVar< T >::Get ( )

inline

Definition at line 80 of file global_var.h.

Set()

template<typename T >

void obs::GlobalVar< T >::Set ( const T &  arg )

inline

Definition at line 75 of file global_var.h.

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

• /home/runner/work/main/main/opencpn/libs/observable/include/observable/global_var.h