please see my answer below.
On Wed, Jun 23, 2010 at 5:42 PM, Stephan Menzel
<stephan.menzel@gmail.com> wrote:
Unless I want to add something. Unfortunately I can't always take
wrap()s output but have to modify a little. In fact, my Queue needs to
be templatized as well, modifying the behaviour of the functor. I have
a template parameter "Calling". When it is true, another function
shall be called by the functor after the method was posted. Now I
wanted to do this by phoenix:
template <bool Calling>
class Queue {
template<typename Handler>
void post(Handler n_handler) {
m_iosrv.post(n_handler);
};
...
template<typename SlotSignature, typename SlotFunction>
boost::signals2::connection
connect(boost::signals2::signal<SlotSignature> &n_signal, SlotFunction
n_method) {
return n_signal.connect(
if_( CallingBack ) [
post(n_method) , m_signal_callback()
] .else_ [
m_iosrv.wrap( n_method )
] );
};
...
It is difficult to conclude smth from the code without having a self-containing example. But my assumption is that in the 'else'-branch your code does not generate a function object. As far as I can see in the 'if'-branch your code generates a function object using the the comma-operator (if that operator is overloaded in Phoenix), in the 'else'-branch you just have a normal function call, which is not lazy and does not return a function-object.
Hope that helps,
Ovanes