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// Boost.Signals library
// Copyright Douglas Gregor 2001-2003. 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 <boost/bind.hpp>
#include <boost/signals/signal1.hpp>
#include <iostream>
struct print_string : public boost::signals::trackable {
typedef void result_type;
void print(const std::string& s) const { std::cout << s << std::endl; }
};
struct my_button {
typedef boost::signal1<void, const std::string&> click_signal_type;
typedef click_signal_type::slot_type click_slot_type;
boost::signals::connection on_click_connect(const click_slot_type& s)
{ return on_click.connect(s); }
my_button(const std::string& l) : label(l) {}
virtual ~my_button() {}
void click();
protected:
virtual void clicked() { on_click(label); }
private:
std::string label;
click_signal_type on_click;
};
void my_button::click()
{
clicked();
}
int main()
{
my_button* b = new my_button("OK!");
print_string* ps = new print_string();
b->on_click_connect(boost::bind(&print_string::print, ps, _1));
b->click(); // prints OK!
delete ps;
b->click(); // prints nothing
return 0;
}
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