Re: [Boost-users] [bind][lambda] overriding return value

On Mon, Jul 21, 2008 at 9:28 PM, Steven Watanabe wrote:

David Rodríguez Ibeas wrote:

...

Hi,

Is it possible to override/generate a return value? I want to connect a signal that has a bool return value to a method that has a void return type, generating always a true return.

class X { public: void f(); }; boost::signal< bool () > sgn;

X x; sgn.connect( boost::bind( &X::f, &x ) ); // error, signal has bool return, method doesn't

Using lambda, you can use the comma operator.

sgn.connect((boost::lambda::bind(&X::f, &x), true))

That's brilliant - I needed exactly this last month! I wish I'd thought of that! Cheers, Rob.