Diff of shared_ptr

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• Go to shared_ptr.

[[C++>CPP]]

- shared_ptrとweak_ptrの使い分けわかる？
--  http://qiita.com/MasayaMizuhara/items/0b78f7046aaa6d17bb66
- boost::shared_ptr
-- http://www.kmonos.net/alang/boost/classes/shared_ptr.html