libs/signals/example/doc_view.cpp
// 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;
}