libs/signals2/example/doc_view.cpp
// Document/View sample for Boost.Signals
// Copyright Keith MacDonald 2005.
// Copyright Frank Mori Hess 2009.
//
// 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/signals2/signal.hpp>
#include <boost/bind.hpp>
//[ document_def_code_snippet
class Document
{
public:
typedef boost::signals2::signal<void ()> signal_t;
public:
Document()
{}
/* Connect a slot to the signal which will be emitted whenever
text is appended to the document. */
boost::signals2::connection connect(const signal_t::slot_type &subscriber)
{
return m_sig.connect(subscriber);
}
void append(const char* s)
{
m_text += s;
m_sig();
}
const std::string& getText() const
{
return m_text;
}
private:
signal_t m_sig;
std::string m_text;
};
//]
//[ text_view_def_code_snippet
class TextView
{
public:
TextView(Document& doc): m_document(doc)
{
m_connection = m_document.connect(boost::bind(&TextView::refresh, this));
}
~TextView()
{
m_connection.disconnect();
}
void refresh() const
{
std::cout << "TextView: " << m_document.getText() << std::endl;
}
private:
Document& m_document;
boost::signals2::connection m_connection;
};
//]
//[ hex_view_def_code_snippet
class HexView
{
public:
HexView(Document& doc): m_document(doc)
{
m_connection = m_document.connect(boost::bind(&HexView::refresh, this));
}
~HexView()
{
m_connection.disconnect();
}
void refresh() 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;
}
private:
Document& m_document;
boost::signals2::connection m_connection;
};
//]
//[ document_view_main_code_snippet
int main(int argc, char* argv[])
{
Document doc;
TextView v1(doc);
HexView v2(doc);
doc.append(argc == 2 ? argv[1] : "Hello world!");
return 0;
}
//]