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std::shared_ptrif you are using C++11. Otherwise it really comes down to whether you are already using boost or are planning to use boost, or interoperate with things using boost. I don't think it's worth including boost just for theshared_ptr, sincecv::Ptrworks well enough.boost::shared_ptrimplementation instead ofstd::shared_ptrwhen using other parts of the boost library. The same is likely to hold for OpenCV too.