static declaration in a c++ class [duplicate]

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
– Cody Gray ♦, Commented Dec 24, 2011 at 16:07

interjay · Accepted Answer · 2011-12-24 15:57:15Z

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, 2011 at 15:57

interjay

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3 Comments

user142019 Over a year ago

Without a space is allowed since C++11.

user142019 Over a year ago

I meant C++11. I'm confused by C99.

M4rk Over a year ago

however, if I do that, it isn't inizialized, right? how can I use Works.myFunc() for example?

Community · Accepted Answer · 2017-05-23 10:34:26Z

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.

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