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Polymorphic template container: shared_ptr vs reference_wrapper

Assuming we have two classes: class A { ... } class B : public A { ... } Would it be better to write std::deque<shared_ptr<A> > container; or ...
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why c++11 define closure as a process of capturing variables

when using closure in other languages, it just feels nature, variables from outer scope are captured automatically , without the need of declaring such captures. in c++11, good to see we have ...