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

From: Sean Rhea (srhea_at_[hidden])
Date: 2006-02-13 17:54:12

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_integral<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_integral<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
-- 
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