Re: Boost in Visual C++ 6.0

From: bill_kempf (williamkempf_at_[hidden])
Date: 2002-05-16 13:55:17

--- In Boost-Users_at_y..., "imi123_1999" <imi123_1999_at_y...> wrote:
> I am a newbie so please help me a little. I am using Visual C++ 6.0 
> in order to compile a program given as an example of threads.

Where did you get the example from?  What version of Boost are you 
using?

> I am 
> also copying the program below. But the problem is that the program 
> is giving errors of unresolved externals. Please tell me how to 
> change the settings of VC++ options. Here is the program:
> 
> #include <boost/thread/thread.hpp>
> #include <iostream>
> 
> int count = 0;
> boost::mutex mutex;
> 
> void increment_count()
> {
>    boost::mutex::lock lock(mutex);
>    std::cout << "count = " << ++count << std::endl;
> }
> 
> int main(int argc, char* argv[])
> {
>    boost::thread_group threads;
>    for (int i = 0; i < 10; ++i)
>       threads.create_thread(&increment_count);
>    threads.join_all();
> }
> 
> 
> The errors i am getting are:
> 
> C:\Windows\Desktop\threadImI\imi.cpp(9) : error C2039: 'lock' : is 
> not a member of 'mutex'
>         c:\program files\microsoft visual studio\vc98
> \include\boost\thread\mutex.hpp(35) : see declaration of 'mutex'
> C:\Windows\Desktop\threadImI\imi.cpp(9) : error C2065: 'lock' : 
> undeclared identifier
> C:\Windows\Desktop\threadImI\imi.cpp(9) : error C2146: syntax 
error : 
> missing ';' before identifier 'lock'
> C:\Windows\Desktop\threadImI\imi.cpp(19) : warning C4508: 'main' : 
> function should return a value; 'void' return type assumed
> Error executing cl.exe.
> Creating browse info file...
> 
> threadImI.exe - 3 error(s), 3 warning(s)

The name "lock" was changed to "scoped_lock" quite some time ago.  I 
don't know where you got the example from, but if it's in the current 
documentation it needs fixing.

Bill Kempf