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https://www.boost.org/doc/libs/1_61_0/libs/smart_ptr/shared_ptr.htm#:~:text=%EE%80%80shared_ptr%EE%80%81%20is%20now%20part%20of%20the%20C%2B%2B11%20Standard%2C,%5B%5D%20or%20T%20%5BN%5D%29%20as%20the%20template%20parameter