Le 11/02/2017 à 18:01, Andrey Semashev via Boost a écrit :

On 02/11/17 19:25, Vicente J. Botet Escriba via Boost wrote:

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Hi,

boost::aligned_storage is not a POD.

I suspect it is because of the declared constructors

private: // noncopyable

aligned_storage(const aligned_storage&); aligned_storage& operator=(const aligned_storage&);

public: // structors

aligned_storage() { }

~aligned_storage() { }

Was this intentional?

Why aligned_storage is not copyable?

The usage pattern of boost::aligned_storage is different from that of std::aligned_storage. You can get a POD type through the nested type typedef:

typedef boost::aligned_storage< 16 >::type aligned_storage_pod;

Thanks, I missed the usage as a trait.

I think, boost::aligned_storage is not copyable because it doesn't know how to copy the contents. And since in C++03 it can't define =default constructors, it had to define a user-defined constructor making the type non-POD. No problem.

Vicente