static declaration in a c++ class

Question

I don't understand why the first doesn't work instead the second works!

#include <boost/bind.hpp>
#include <boost/function.hpp>

#include "concurrentQueue.h";
class TestClass {
    public:              
                static concurrentQueue<function<void()>> notW;

                static concurrentQueue<int> Works;
}

I attach also the beginning of the concurrentQueue class:

template<class Data> class concurrentQueue

I'm not blaming you. :-) I wasn't the one who downvoted your question. I didn't know the answer either. It's just good to keep duplication to a minimum around here. Existing questions are hard enough to find as it is. — Cody Gray, Dec 24 '11 at 16:07

score 2 · Accepted Answer · answered Dec 24 '11 at 15:57

2

Put a space inside the >> to prevent it from being treated as a right-shift operator:

static concurrentQueue<function<void()> > notW;

With C++11 compilers this won't be necessary, as the compiler will interpret the angle brackets as closing the template argument list where possible.

answered Dec 24 '11 at 15:57

interjay

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Without a space is allowed since C++11. – Dec 24 '11 at 15:58
I meant C++11. I'm confused by C99. – Dec 24 '11 at 16:00
however, if I do that, it isn't inizialized, right? how can I use Works.myFunc() for example? – M4rk Dec 24 '11 at 18:42

score 2 · Answer 2 · edited May 23 '17 at 10:34

2

You need a space between the two closing angle brackets in C++ 03 and earlier. This has been "fixed" in the new 2011 standard.

See for example this question for more information.

edited May 23 '17 at 10:34

Community

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answered Dec 24 '11 at 15:58

Paolo Capriotti

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static declaration in a c++ class

2 Answers2