{"id":16640,"date":"2024-03-15T13:22:57","date_gmt":"2024-03-15T13:22:57","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-are-the-characteristics-of-shared_ptr-in-c\/"},"modified":"2025-08-07T04:39:15","modified_gmt":"2025-08-07T04:39:15","slug":"what-are-the-characteristics-of-shared_ptr-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-are-the-characteristics-of-shared_ptr-in-c\/","title":{"rendered":"What are the characteristics of shared_ptr in C++?"},"content":{"rendered":"

In C++, shared_ptr is a smart pointer class used for managing dynamically allocated memory resources. It has the following characteristics:<\/p>\n

    \n
  1. Reference counting: shared_ptr uses reference counting to keep track of how many shared_ptr point to the same object. The counter increases each time a shared_ptr is created or copied. The counter decreases each time a shared_ptr is destroyed or reset. When the counter reaches zero, the shared_ptr automatically destroys the object and releases the memory.<\/li>\n
  2. Automatic resource release: shared_ptr uses the RAII (Resource Acquisition Is Initialization) technique to automatically release relevant resources when the object’s lifetime ends, eliminating the need for manually calling delete.<\/li>\n
  3. Ownership shared among multiple shared_ptr objects: shared_ptr allows multiple shared_ptr objects to share the same memory resource. The memory will only be released when all shared_ptr objects are destroyed or reset.<\/li>\n
  4. Custom Deleter: shared_ptr allows a specified deleter function to replace the default delete operation, enabling custom resource release.<\/li>\n
  5. shared_ptr can be a null pointer (nullptr) and it supports comparison with nullptr.<\/li>\n
  6. Copyable: shared_ptr can be copied, each copy increases the reference count. Memory is released when the last shared_ptr is destroyed.<\/li>\n
  7. Exception safety: the destructor and deleter of shared_ptr will work correctly even if an exception is thrown, preventing resource leaks.<\/li>\n
  8. Support for custom deleters: shared_ptr can release memory using a custom deleter, such as a custom function, function object, or lambda expression.<\/li>\n<\/ol>\n

    In general, shared_ptr provides a safe and convenient way to manage dynamically allocated memory in C++, allowing multiple shared_ptrs to share the same memory resource. It is an important memory management tool in C++.<\/p>\n","protected":false},"excerpt":{"rendered":"

    In C++, shared_ptr is a smart pointer class used for managing dynamically allocated memory resources. It has the following characteristics: Reference counting: shared_ptr uses reference counting to keep track of how many shared_ptr point to the same object. The counter increases each time a shared_ptr is created or copied. The counter decreases each time a […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[453,1402,299,1404,1403],"class_list":["post-16640","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"\nWhat are the characteristics of shared_ptr in C++? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about what are the characteristics of shared_ptr in c++?. 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