boost signal 用法与用处...

本文转载自查看原文 2012-01-12 17:56 4246 C++

boost 的强大已经不用置疑, 仅仅的 signal 功能已经可以让无数的C++程序员们带来极大的便利. 现在, 不用再羡慕C#或java的委托和事件了, 这得归功于 boost的signal. signal的用法, 直接上代码, 代码源自于boost提供的例子:

// Document/View sample for Boost.Signals
// Copyright Keith MacDonald 2005. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt )
// For more information, see http://www.boost.org

#include <iostream>
#include < string>
#include <boost/signal.hpp>
#include <boost/bind.hpp>

class Document
{
public:
    typedef boost::signal< void ( bool)>  signal_t;
    typedef boost::signals::connection  connection_t;

public:
    Document()
    {}

    connection_t connect(signal_t::slot_function_type subscriber)
    {
         return m_sig.connect(subscriber);
    }

     void disconnect(connection_t subscriber)
    {
        subscriber.disconnect();
    }

     void append( const char* s)
    {
        m_text += s;
        m_sig( true);
    }

     const std:: string& getText() const
    {
         return m_text;
    }

private:
    signal_t    m_sig;
    std:: string m_text;
};

class View
{
public:
    View(Document& m)
        : m_document(m)
    {
        m_connection = m_document.connect(boost::bind(&View::refresh, this, _1));
    }

     virtual ~View()
    {
        m_document.disconnect(m_connection);
    }

     virtual void refresh( bool bExtended) const = 0;

protected:
    Document&               m_document;

private:
    Document::connection_t  m_connection;
};

class TextView : public View
{
public:
    TextView(Document& doc)
        : View(doc)
    {}

     virtual void refresh( bool bExtended) const
    {
        std::cout << " TextView: " << m_document.getText() << std::endl;
    }
};

class HexView : public View
{
public:
    HexView(Document& doc)
        : View(doc)
    {}

     virtual void refresh( bool bExtended) const
    {
         const std:: string&  s = m_document.getText();

        std::cout << " HexView: ";

         for (std:: string::const_iterator it = s.begin(); it != s.end(); ++it)
            std::cout << ' ' << std::hex << static_cast< int>(*it);

        std::cout << std::endl;
    }
};

int main( int argc, char* argv[])
{
    Document    doc;
    TextView    v1(doc);
    HexView     v2(doc);

    doc.append(argc == 2 ? argv[ 1] : " Hello world! ");
     return 0;
}

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