Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 11.04 (natty)

IDE(s):

Qt Creator 2.0.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.5.2

Libraries used:

Boost: version 1.42
STL: GNU ISO C++ Library, version 4.5.2

Qt project file: CppBoostSignalExample2.pro


#-------------------------------------------------

#

# Project created by QtCreator 2011-08-12T10:26:40

#

#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = CppBoostSignalExample2

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

main.cpp


#include <iostream>

#include <boost/bind.hpp>

#include <boost/lambda/lambda.hpp>

#include <boost/signals2.hpp>



struct Thing

{

  Thing(const int id) : m_id(id) {}

  boost::signals2::signal<void (const Thing*)> m_signal;

  const int m_id;

  void EmitMe() const { m_signal(this); }

};



struct Manager

{

  Manager()

  {

    for (int i=0; i!=5; ++i)

    {

      boost::shared_ptr<Thing> t(new Thing(i));

      //Do not forget the placeholder!

      t->m_signal.connect(boost::bind(&Manager::OnSignal,this, boost::lambda::_1));

      m_v.push_back(t);

    }

  }

  void EmitRandom()

  {

    const int i = std::rand() % 5;

    m_v[i]->EmitMe();

  }



  private:



  std::vector<boost::shared_ptr<Thing> > m_v;



  void OnSignal(const Thing* thing)

  {

    std::cout << thing->m_id << '\n';

  }

};



int main()

{

  Manager m;

  for (int i=0; i!=10; ++i) m.EmitRandom();

}

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(C++) Boost signal example 2: emitting this

Technical facts

Qt project file: CppBoostSignalExample2.pro

main.cpp