Webb15 mars 2024 · When shared_ptr is created by calling std::make_shared or std::allocate_shared, the memory for both the control block and the managed object is created with a single allocation. The managed object is constructed in-place in a data member of the control block. The shared_ptr type is a smart pointer in the C++ standard library that is designed for scenarios in which more than one owner might have to manage the lifetime of the object in memory. After you initialize a shared_ptr you can copy it, pass it by value in function arguments, and assign it to other shared_ptr instances. Visa mer The examples that follow all assume that you've included the required headers and declared the required types, as shown here: Visa mer The following example shows how to declare and initialize shared_ptr instances that take on shared ownership of an object that has already been … Visa mer Whenever possible, use the make_shared function to create a shared_ptr when the memory resource is created for the first time. make_shared is exception-safe. It uses the same call to allocate the memory for the control block … Visa mer shared_ptr is also helpful in C++ Standard Library containers when you're using algorithms that copy elements. You can wrap elements in a shared_ptr, and then copy it into other … Visa mer
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