(C++) Boost signal example 1: comparing Boost and Qt

 

This Boost signal example shows both the use of Boost signals and Qt signals.

 

The article From Qt signal to Boost signal describes why and how to move from using Qt signals to using Boost signals.

 

• Download the Qt Creator project 'CppBoostSignalExample1' (zip)

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Ubuntu 10.10 (maverick)

IDE(s):

• Qt Creator 2.0.0

Project type:

• Console application

Compiler(s):

• G++ 4.4.5

Libraries used:

• Boost: version 1.42
• Qt: version 4.7.0 (32 bit)
• STL: GNU ISO C++ Library, version 4.4.5

 

 

 

 

 

Qt project file: CppSignal.pro

 

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#------------------------------------------------- # # Project created by QtCreator 2010-12-29T13:23:42 # #------------------------------------------------- QT       += core QT       -= gui TARGET = CppSignal CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app SOURCES += main.cpp \     emitter.cpp \     receiver.cpp HEADERS += \     emitter.h \     receiver.h

 

 

 

 

 

emitter.cpp

 

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#include <iostream> #include "emitter.h" QtEmitter::QtEmitter(QObject *parent) :     QObject(parent) { } void QtEmitter::DoEmit() {   std::clog << "QtEmitter: emitting signal\n";   emit signal_emit(); } void Emitter::DoEmit() {   m_signal();   std::clog << "Emitter: emitting signal\n"; }

 

 

 

 

 

emitter.h

 

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#ifndef EMITTER_H #define EMITTER_H #include <QObject> class QtEmitter : public QObject {   Q_OBJECT public:   explicit QtEmitter(QObject *parent = 0);   void DoEmit(); signals:   void signal_emit(); }; #include <boost/signals2.hpp> struct Emitter {   boost::signals2::signal<void ()> m_signal;   void DoEmit(); }; #endif // EMITTER_H

 

 

 

 

 

main.cpp

 

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#include <boost/signals2.hpp> #include "emitter.h" #include "receiver.h" int main() {   {     //The Qt way     QtEmitter e;     QtReceiver r;     QObject::connect(&e,SIGNAL(signal_emit()),&r,SLOT(OnReceive()));     e.DoEmit();   }   {     //The Boost way     Emitter e;     Receiver r;     e.m_signal.connect(       boost::bind(         &Receiver::OnReceive,         r));     e.DoEmit();   } }

 

 

 

 

 

receiver.cpp

 

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#include <iostream> #include "receiver.h" QtReceiver::QtReceiver(QObject *parent) :     QObject(parent) { } void QtReceiver::OnReceive() {   std::clog << "QtReceiver: received signal\n"; } void Receiver::OnReceive() {   std::clog << "Receiver: received signal\n"; }

 

 

 

 

 

receiver.h

 

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#ifndef RECEIVER_H #define RECEIVER_H #include <QObject> class QtReceiver : public QObject {   Q_OBJECT public:   explicit QtReceiver(QObject *parent = 0); signals: public slots:   void OnReceive(); }; #include <boost/signals2.hpp> struct Receiver {   void OnReceive(); }; #endif // RECEIVER_H