From: Christian Larsen (contact_at_[hidden])
Date: 2008-08-18 13:26:27
Hah, what a coincidence. I see that Hajo Kirchhoff has just asked
basically the same question two hours before me.
See "[Boost-users] [function] function_equal or function::operator==
ambiguous overload?"
Is this something which has changed in 1.36.0? Will go check with an
older version...
Best regards,
Christian
Christian Larsen skrev:
> Hi,
>
> I'm storing function objects in a std::vector, but to remove one again,
> I need to find an iterator to the one I want to remove. I do this in an
> "unregister" function taking a single boost::function<void ()> as
> parameter. Inside the function I would like to use the std::find
> algorithm to get an iterator to that function in the vector. I'm getting
> compile errors, though; see the example below. How do I fix these?
>
> I'm using MSVC++ 8 (SP1), and Boost 1.33.1 (can not upgrade).
>
> Example, where in my "unregister" function I use find as in the last
> part of this example (i.e. I have a Listener and not a plain function
> pointer). This does not compile:
>
>
> #include <algorithm>
> #include <vector>
> #include <boost/function.hpp>
>
> using namespace std;
> using namespace boost;
>
> void listenerA() {}
> void listenerB() {}
>
> int main()
> {
> typedef function<void ()> Listener;
> typedef vector<Listener> ListenerVector;
>
> ListenerVector listeners;
>
> listeners.push_back(&listenerA);
> listeners.push_back(&listenerB);
>
> ListenerVector::iterator iter;
>
> // This compiles and works
> iter = find(
> listeners.begin(), listeners.end(),
> &listenerB);
>
> assert(iter != listeners.end());
>
> // This gives:
> // error C2666: 'boost::operator ==' : 4 overloads have
> // similar conversions
> iter = find(
> listeners.begin(), listeners.end(),
> Listener(&listenerB));
>
> assert(iter != listeners.end());
>
> return 0;
> }
[SNIP]