provide detach() function for shared pointer

[nobody]

I suggest that we should provide a new method T* detachPtr() for shared_ptr to let the shared_ptr pass owner ship to other fuctions or applications. 

It is a comman case that user will have to let the share_ptr give up the owenership of the objec, pass the object to other application let that application take care the objcet's life. But there is no method to do so.

[Peter Dimov]

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There are no plans to add a release() member to shared_ptr at this time; this is in the FAQ.