[function] How to extract a tuple<A0,A1> of arguments from a boost::function<>?

7 Aug 2003

      Short question:

As the Subject says,
given a boost::function{1..N}<>,
how can I extract a tuple of all its arguments?

Long question:

Anyway, what I'm really trying to do is this:

Given some classes with different methods:

struct X {  void f(int n ) ; } ;
struct Y {  void g(char c, double d ) ; } ;

I want to easly create _polymorphic_ closures binding member functions of X /Y with instances of
X/Y and function arguments.
The goal is the have a deferred 'action' list for easy backtracing of an algorithm.
That is, instead of directly calling:

X x ;
Y y ;
x.f(1);
y.g('a',1.2);

I want to do something that would look like:

X x;
Y y;
ActionList actions;
actions.push_back( make_closure(&X::f, x,1) );
actions.push_back( make_closure(&Y::g, y,'a',1.2) );
std::for_each(actions.begin(),actions.end(),execute_action());

TIA

Fernando Cacciola