On 7/27/2011 3:35 PM, Igor R wrote:

...

My compiler crashes when I write:

bind(&S::bar,&s1);

is there some known issue with VS8?

Yes, VC8 crashes on incorrect bind expressions. You probably missed some placeholder.

Thanks. Can someone tell me what's wrong? I thought I followed the example from the manual. void foo (int); class S { const char* const name; public: S(const char* x) : name(x) {} void bar (int); }; S s1 ("s1"); // some instance void subscribe (State_t st, const NotifyFunc& func); subscribe (STATE1, &foo); // this works, so the form of the function parameters is right. subscribe (STATE1, bind(&S::bar, &s1)); // this one is wrong. Why?

On Thu, Jul 28, 2011 at 9:19 AM, John M. Dlugosz wrote:

On 7/27/2011 3:35 PM, Igor R wrote:

...

My compiler crashes when I write:

...

bind(&S::bar,&s1);

is there some known issue with VS8?

Yes, VC8 crashes on incorrect bind expressions. You probably missed some placeholder.

Thanks. Can someone tell me what's wrong? I thought I followed the example from the manual.

void foo (int);

class S { const char* const name; public: S(const char* x) : name(x) {} void bar (int); };

S s1 ("s1"); // some instance

void subscribe (State_t st, const NotifyFunc& func);

subscribe (STATE1, &foo); // this works, so the form of the function parameters is right.

subscribe (STATE1, bind(&S::bar, &s1)); // this one is wrong. Why?

Does subscribe (STATE1, bind(&S::bar, s1)); work?

On 7/28/2011 3:50 AM, Nathan Ridge wrote:

f = bind(&S::bar, s1, _1)

Thanks. I understand what _1 does. I thought that leaving off the real arguments and giving only the object would produce a function object taking those same arguments. I guess the compiler can't hand that automatically? Now I get V:\boost_1_47\boost/bind/bind.hpp(69) : error C2825: 'F': must be a class or namespace when followed by '::' V:\boost_1_47\boost/bind/bind_template.hpp(15) : see reference to class template instantiation 'boost::_bi::result_traits' being compiled with [ R=boost::_bi::unspecified, F=void (__thiscall S::* )(uint32_t,call_state_machine::State_t,call_state_machine::State_t) ] .\StateMachine\Call\Windows\StateProcess.cpp(54) : see reference to class template instantiation 'boost::_bi::bind_t' being compiled with [ R=boost::_bi::unspecified, F=void (__thiscall S::* )(uint32_t,call_state_machine::State_t,call_state_machine::State_t), L=boost::_bi::list2,boost::arg<1>> ] V:\boost_1_47\boost/bind/bind.hpp(69) : error C2039: 'result_type' : is not a member of '`global namespace'' V:\boost_1_47\boost/bind/bind.hpp(69) : error C2146: syntax error : missing ';' before identifier 'type' V:\boost_1_47\boost/bind/bind.hpp(69) : error C2208: 'boost::_bi::type' : no members defined using this type F in the first complaint is the pointer-to-function type, so I agree that F::result_type doesn't make sense.

On 7/28/2011 4:58 AM, Igor R wrote:

It seems that the number of placeholders still doesn't match the member function signature.

Ah yes, thank you for helping me see the obvious. While this discussion was going on in email, I added more parameters to the function in my project. I need to update that line, as well! —John

On 7/28/2011 6:28 AM, Pace, Antony [Harman Pro Group UK] wrote:

Is your second parameter the address of a class or the class itself? My usual problem with bind is forgetting the 'this' as the second parameter for a member function. Ant

From the documentation, passing the class instance itself will make a copy held inside the function object. Passing the address will store a pointer inside the function object, so it will refer to my instance (which must continue to exist as long as that function object).

  void bar (int);   }; <...> subscribe (STATE1, bind(&S::bar, &s1));  // this one is wrong.  Why?

bind(&S::bar, &s1, _1)