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

 

This Boost signal example shows how to emit this.

 

• Download the Qt Creator project 'CppBoostSignalExample2' (zip)

 

 

 

 

 

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

 

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

 

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#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(); }