bf.cxx: In function 'bool cmp(func_type)':
bf.cxx:9: error: ambiguous overload for 'operator==' in 'f == boost::function<void ()(int), std::allocator<void> >()'
bf.cxx:9: note: candidates are: operator==(void (boost::function1<void, int, std::allocator<void> >::dummy::*)(), void (boost::function1<void, int, std::allocator<void> >::dummy::*)()) <built-in>
/usr/local/include/boost/function/function_template.hpp:706: note:                 void boost::operator==(const boost::function1<R, T0, Allocator>&, const boost::function1<R, T0, Allocator>&) [with R = void, T0 = int, Allocator = std::allocator<void>]
/usr/local/include/boost/function/function_base.hpp:647: note:                 typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<T>::value>::value, bool>::type boost::operator==(Functor, const boost::function_base&) [with Functor = boost::function<void ()(int), std::allocator<void> >]
/usr/local/include/boost/function/function_base.hpp:638: note:                 typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<T>::value>::value, bool>::type boost::operator==(const boost::function_base&, Functor) [with Functor = boost::function<void ()(int), std::allocator<void> >]
/usr/local/include/boost/function_equal.hpp: In function 'bool boost::function_equal_impl(const F&, const G&, long int) [with F = boost::function<void ()(int), std::allocator<void> >, G = boost::function<void ()(int), std::allocator<void> >]':
/usr/local/include/boost/function_equal.hpp:24:   instantiated from 'bool boost::function_equal(const F&, const G&) [with F = func_type, G = func_type]'
bf.cxx:16:   instantiated from here
/usr/local/include/boost/function_equal.hpp:17: error: ambiguous overload for 'operator==' in 'f == g'
/usr/local/include/boost/function_equal.hpp:17: note: candidates are: operator==(void (boost::function1<void, int, std::allocator<void> >::dummy::*)(), void (boost::function1<void, int, std::allocator<void> >::dummy::*)()) <built-in>
/usr/local/include/boost/function/function_base.hpp:638: note:                 typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<T>::value>::value, bool>::type boost::operator==(const boost::function_base&, Functor) [with Functor = boost::function<void ()(int), std::allocator<void> >]
/usr/local/include/boost/function/function_base.hpp:647: note:                 typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<T>::value>::value, bool>::type boost::operator==(Functor, const boost::function_base&) [with Functor = boost::function<void ()(int), std::allocator<void> >]
/usr/local/include/boost/function/function_template.hpp:706: note:                 void boost::operator==(const boost::function1<R, T0, Allocator>&, const boost::function1<R, T0, Allocator>&) [with R = void, T0 = int, Allocator = std::allocator<void>]