Property

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#include <windows.h>
#include <iostream>

template <class object, class type>
class property
{
public:

    typedef type (object::*get_proc)() const;
    typedef void (object::*set_proc)(type const&);

    property(object& object, get_proc getpr, set_proc setpr)
    : obj   (object)
    , getter(getpr)
    , setter(setpr)
    {
    }

    operator type ()
    {
        return get();
    }

    type const& operator = (type const& value)
    {
        set(value);
        return value;
    }

    property& operator = (property const& prt)
    {
        set(prt.get());
        return *this;
    }

private:

    object& obj;
    get_proc getter;
    set_proc setter;

    inline type get() const
    {
        return (obj.*getter)();
    }

    inline void set(type const& value)
    {
        (obj.*setter)(value);
    }
};

class window
{
public:

    property<window, std::string> title;

    window(std::string const& title_text)
    : title(*this, &window::get_title, &window::set_title)
    {
        // Как-то инициализируем handle
        set_title(title_text);
    }

private:

    HWND handle;

    std::string get_title() const
    {
        char buffer[1024] = {0};
        GetWindowTextA(handle, buffer, sizeof(buffer));
        return buffer;
    }

    void set_title(const std::string& new_title)
    {
        SetWindowTextA(handle, new_title.c_str());
    }
};

int main()
{
    window w1("Toolbar");
    window w2("About box");

    w1.title = "Help page";

    std::string title = w2.title;

    w2.title = w1.title;

    return 0;
}