Ok, I analyzed your problem once again. It seems you're trying to make a copy of 'concurrent_queue<Data>' somewhere in your code: -- This diagnostic occurred in the compiler generated function

'concurrent_queue<Data>::concurrent_queue(concurrent_queue<Data> &)') --

you can see the copy constructor called. the problem is that boost::mutex and boost::condition_variable are instances of boost::noncopyable (copy constructor and assignment operator are private to prevent from copying objects). you have two options: 1) prevent copying 'concurrent_queue' objects 2) implement copy constructor in 'concurrent_queue' to initialize 'the_mutex' and 'the_condition_variable' using their default constructors WBR, Adam Romanek On 07/20/2011 09:21 AM, Sean Farrow wrote:

Hi:

I’m using a queue written I think as I remember by Antony Williams (sorry if this is incorrect but it was certainly someone in the uk).

The code is below, I’m getting 2 c2248 errors indicated by visual c++ 2010 at the last line of the class i.e the line with };

Does anyone know what’s causing this?

The errors are:

1>d:\dropbox\mackie display reader\surface reader\surface reader\queue.hpp(18): error C2248: 'boost::mutex::mutex' : cannot access private member declared in class 'boost::mutex'

c:\program files\boost\boost\thread\win32\mutex.hpp(26) : see declaration of 'boost::mutex::mutex'

c:\program files\boost\boost\thread\win32\mutex.hpp(22) : see declaration of 'boost::mutex'

This diagnostic occurred in the compiler generated function 'concurrent_queue<Data>::concurrent_queue(concurrent_queue<Data> &)'

with

[

Data=PmEvent

]

1>d:\dropbox\mackie display reader\surface reader\surface reader\queue.hpp(18): error C2248: 'boost::condition_variable::condition_variable' : cannot access private member declared in class 'boost::condition_variable'

c:\program files\boost\boost\thread\win32\condition_variable.hpp(299) : see declaration of 'boost::condition_variable::condition_variable'

c:\program files\boost\boost\thread\win32\condition_variable.hpp(295) : see declaration of 'boost::condition_variable'

This diagnostic occurred in the compiler generated function 'concurrent_queue<Data>::concurrent_queue(concurrent_queue<Data> &)'

with

[

Data=PmEvent

]

PmEvent is just a standard c structure:

typedefstruct {

PmMessage message;

PmTimestamp timestamp;

} PmEvent;

PmTimestamp and PmMessage are defined as:

typedefint32_t PmMessage/PmTimeStamp;

any help appreciated.

Cheers

Sean.

--begin code—

#include<queue>

#include

#include

template<typename Data>

classconcurrent_queue {

private:

boost::mutex the_mutex;

boost::condition_variable the_condition_variable;

std::queue<Data> the_data;

public:

void push(Data const& data)

{

boost::mutex::scoped_lock lock(the_mutex);

the_queue.push(data);

lock.unlock();

the_condition_variable.notify_one();

}

};

--end code--

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