Re: [Boost-Users] GCC 3.2 compiler error using Boost::Threads::Mutex::scoped_lock

4 Mar 2003

      Michael Hunley wrote:
...
Disclaimer: I am relatively new to gcc, linux and Boost.  I'm hoping 
someone out in the group who is much more knowledgable about all of them 
can help me get past a hurdle in code I am porting from Windows.  I am 
getting a vague error message from g++ (gcc 3.2-7 under Redhat Linux 8.0) 
in my code using the Boost scoped_lock.
[ snip ]
...
The error is "ISO C++ forbids declarations of 'type name' with no
type".  I
...
get that error on several lines, but most notably on a simple 
declaration like:
         PScopedLock     Lock(MyMutex);
Hi Michael,

I think you will need to post some more code; I have tried the code you 
posted, including your simple declaration, on the same platform (gcc 
3.2-7 under Redhat Linux 8.0) - with boost 1.29.0. This compiles without 
error. (See below.)

Regards,

Stephen Jackson
-- 
stephen.jackson@scribitur.com       http://www.scribitur.com/spj/

gcc -c -Iboost_1_29_0 testit.cpp  -Wall

#include "boost/thread/mutex.hpp"

// Begin your posted code

class PMutex
{
public:
          PMutex() {}
          virtual ~PMutex() {}

protected:
          boost::mutex    m_Mutex;
          friend class PScopedLock;
};

class PScopedLock
{
public:
          explicit PScopedLock( PMutex& M )       : 
m_ScopedLock(M.m_Mutex) {}
          virtual ~PScopedLock() {}

          static PScopedLock*     Create( PMutex& M ) { return
(PScopedLock*) ::new PScopedLock(M); }
          void Destroy( void ) { delete this;     }

protected:
          void* operator new(size_t) {}   /* disallowed, must declare on 
            the stack */
          boost::mutex::scoped_lock       m_ScopedLock;
          friend class PCondition;
};

// End your posted code

void this_is_a_test()
{
	PMutex MyMutex;
	PScopedLock Lock(MyMutex); // Compiles OK
}