C++ : When to use boost::optional and when to use std::unique_ptr in cases when you want to implemen

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C++ : When to use boost::optional and when to use std::unique_ptr in cases when you want to implement a function that can return "nothing"?
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C++ : When to use boost::optional and when to use std::unique_ptr in cases when you want to implement a function that can return "nothing"?
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