https://www.boost.org/doc/libs/1_79_0/libs/smart_ptr/doc/html/smart_ptr.html
Boost.SmartPtr: The Smart Pointer Library
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https://www.boost.org/doc/libs/1_68_0/libs/smart_ptr/doc/html/smart_ptr.html
Boost.SmartPtr: The Smart Pointer Library
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https://www.boost.org/doc/libs/1_76_0/libs/smart_ptr/doc/html/smart_ptr.html
Boost.SmartPtr: The Smart Pointer Library
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