Here is a better example. I am breaking standards when upcasting a pointer
to member though ((void (B::*)(int) -> (void (Object::*)(int))). This is
why I never proposed it ;)
#include <list>
#include <utility>
#include <iostream>
using namespace std;
struct Object
{
};
template <typename T>
struct signal : list< pair<Object *, T Object::*> >
{
typedef typename list< pair<Object *, T Object::*> >::value_type
value_type;
void connect(Object * p, T Object::* s)
{
push_back(value_type(p, s));
}
template <typename U, typename V>
void emit(U const & u, V const & v)
{
for (typename list<value_type>::iterator i = begin(); i != end(); ++ i)
{
(i->first->*i->second)(u, v);
}
}
template <typename U>
void emit(U const & u)
{
for (typename list<value_type>::iterator i = begin(); i != end(); ++ i)
{
(i->first->*i->second)(u);
}
}
void emit()
{
for (typename list<value_type>::iterator i = begin(); i != end(); ++ i)
{
(i->first->*i->second)();
}
}
};
// Usage example:
struct A : Object
{
signal<void (int)> sigdone;
};
struct B : Object
{
void slot_bip(int a, ...)
{
cout << __PRETTY_FUNCTION__ << ": " << a << endl;
}
void slot_refresh(int a, ...)
{
cout << __PRETTY_FUNCTION__ << ": " << a << endl;
}
};
int main()
{
A a;
B b;
a.sigdone.connect(& b, (void (Object::*)(int)) & B::slot_bip);
a.sigdone.connect(& b, (void (Object::*)(int)) & B::slot_refresh);
a.sigdone.emit(99);
}
Philippe
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