Re: [Boost-users] bind()ing only some arguments of a member function

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-02-13 18:32:17

I think you need to modify the bind to be:

bind(&MyClass::foo,this,_1);

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] 
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Sean Rhea
> Sent: Monday, February 13, 2006 2:54 PM
> To: boost-users_at_[hidden]
> Subject: [Boost-users] bind()ing only some arguments of a 
> member function
> 
> Hello,
> 
> Can someone please tell me why this doesn't work?
> 
> 
> #include <boost/bind.hpp>
> #include <boost/function.hpp>
> #include <boost/shared_ptr.hpp>
> 
> using namespace std;
> using namespace boost;
> 
> struct MyClass {
>      int i;
>      void foo(int j){
>          printf("%d, %d\n", i, j);
>      }
>      function<void(int)> bar() {
>          return bind<void>(&MyClass::foo, this);
>      }
> };
> 
> 
> $ g++ -c -g  -I/usr/local/include/boost-1_33_1 -I.. foo.cpp
> /usr/local/include/boost-1_33_1/boost/mem_fn.hpp: In member function  
> 'R& boost::_mfi::dm<R, T>::operator()(T*) const [with R = void () 
> (int), T = MyClass]':
> /usr/local/include/boost-1_33_1/boost/bind.hpp:229:   instantiated  
> from 'void boost::_bi::list1<A1>::operator()(boost::_bi::type<void>,  
> F&, A&, int) [with F = void (MyClass::*)(int), A =  
> boost::_bi::list1<int&>, A1 = boost::_bi::value<MyClass*>]'
> /usr/local/include/boost-1_33_1/boost/bind/bind_template.hpp:32:    
> instantiated from 'typename boost::_bi::result_traits<R, F>::type  
> boost::_bi::bind_t<R, F, L>::operator()(A1&) [with A1 = int, R =  
> void, F = void (MyClass::*)(int), L =  
> boost::_bi::list1<boost::_bi::value<MyClass*> >]'
> /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 
> 136:   instantiated from 'static void  
> boost::detail::function::void_function_obj_invoker1<FunctionObj, R,  
> T0>::invoke(boost::detail::function::any_pointer, T0) [with  
> FunctionObj = boost::_bi::bind_t<void, void (MyClass::*)(int),  
> boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, 
> T0 = int]'
> /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 
> 479:   instantiated from 'void boost::function1<R, T0,  
> Allocator>::assign_to(FunctionObj,  
> boost::detail::function::function_obj_tag) [with FunctionObj =  
> boost::_bi::bind_t<void, void (MyClass::*)(int),  
> boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 =  
> int, Allocator = std::allocator<void>]'
> /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 
> 430:   instantiated from 'void boost::function1<R, T0,  
> Allocator>::assign_to(Functor) [with Functor =  
> boost::_bi::bind_t<void, void (MyClass::*)(int),  
> boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 =  
> int, Allocator = std::allocator<void>]'
> /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 
> 294:   instantiated from 'boost::function1<R, T0,  
> Allocator>::function1(Functor, typename  
> boost::enable_if_c<boost::type_traits::ice_not<boost::is_integ
> ral<Functo 
> r>::value>::value, int>::type) [with Functor =  
> boost::_bi::bind_t<void, void (MyClass::*)(int),  
> boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 =  
> int, Allocator = std::allocator<void>]'
> /usr/local/include/boost-1_33_1/boost/function/function_template.hpp: 
> 637:   instantiated from 'boost::function<R ()(T0),  
> Allocator>::function(Functor, typename  
> boost::enable_if_c<boost::type_traits::ice_not<boost::is_integ
> ral<Functo 
> r>::value>::value, int>::type) [with Functor =  
> boost::_bi::bind_t<void, void (MyClass::*)(int),  
> boost::_bi::list1<boost::_bi::value<MyClass*> > >, R = void, T0 =  
> int, Allocator = std::allocator<void>]'
> foo.cpp:15:   instantiated from here
> /usr/local/include/boost-1_33_1/boost/mem_fn.hpp:347: error: invalid  
> use of non-static member function
> 
> 
> Thanks,
> Sean
> -- 
>         Compassion, tolerance, consideration of others, the 
> responsible
>            use of knowledge and power. These principles transcend the
>           barriers between religious believers and non-believers; they
>                   belong not to one faith, but to all faiths.
>                              -- The 14th Dalai Lama
> 
> 
>