shared_ptr

std::weak_ptr

std::unique_ptr models the concept of exclusive ownership, std::shared_ptr the concept of shared ownership. If I stick to this picture then std::weak_ptr models the concept of temporary ownership because it borrows the resource from a std::shared_ptr. There is one dominant reason for having a std::weak_ptr in C++: breaking of cyclic references of std::shared_ptr's.

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Specialities of std::shared_ptr

After I draw the big picture of a std::shared_ptr's in the last post, I want to present two special aspects of this smart pointer in this post. First, I show with std::shared_from_this how to create a std::shared_ptr from an object; second, I'm interested in the question to the answer: Should a function take a std::shared_ptr by copy or by reference? The numbers are quite interesting.

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std::shared_ptr

std::shared_ptr's share the resource. The shared reference counter counts the number of owners. Copying a std::shared_ptr increases the reference count by one. Destroying a std::shared_ptr decreases the reference count by one. If the reference count becomes zero, the resource will automatically be released. 

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Memory and Performance Overhead of Smart Pointers

C++11 offers four different smart pointers. On two of them I will have a closer look in this post regarding memory and performance overhead. My first candidate std::unique_ptr takes exclusively care of the lifetime of one resource; std::shared_ptr shares the ownership of a resource with other std::shared_ptr's. I will state the result of my tests before I show you the raw numbers: There are only few reasons in modern C++ justifying the memory management with new and delete.

 

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