[Boost-users] using boost::shared_ptr with boost::signal

From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2004-07-24 02:16:49

Hi,

I want to use boost::shared_ptr with boost::signal.

class A
{
private:
        int     _i;
public:
        A() : _i( 0) {}

        void operator()( int, std::string & s)
        { i+= 1; }

        void operator()( std::string & s, int)
        { i+= 2; }
};

boost::shared_ptr< A > a( new A() );
boost::signal< void( int, std::string &) > rsig;
boost::singal< void( std::string &, int) > lsig;

rsig.connect( a);
lsig.connect( a);

rsig(0,"called from right side");
lsig("called from left side",0);

Because a is a smart_ptr this code would not compile because operator() is not 
a member function. If I dereference the smart pointer when I connect to 
signal, changes of a are never know by the other signal instance.
Maybe I can use a proxy class which aggregates the smart pointer but maybe 
there is a better solution?!

with best regards,
Oliver

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