[Boost-users] Signals, Format and Bind

I have two signals: signal source; signal target; What want is for every call: source(12345); to have a call: target("the value is 12345"); I am trying to achieve this with format and bind, but without much luck. What I came up with is the following: source.connect(bind(ref(target), bind(&format::str, bind(&format::operator%, format("the value is %1"), _1))); Unfortunately the code above treats the parameter to source as if it was empty, i.e. I get calls target("the value is "); What am I doing wrong and how can this be done correctly? -- Memfis