typedef and incomplete type

Question

Recently I am having many problem with typedef and incomplete type when I changed certain containers, allocators in my code.

What I had previously

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Answer 1

Compiller doesn't know the size of incomplete type, therefore it can not instantiate it nor allocate some memory for it. Having a pointer to object (like typedef std::tr1::array all_foos; ) instead of instance of the object itself solves this issue.