unique-ptr

Why can I not push_back a unique_ptr into a vector?

You need to move the unique_ptr: vec.push_back(std::move(ptr2x)); unique_ptr guarantees that a single unique_ptr container has ownership of the held pointer. This means that you can’t make copies of a unique_ptr (because then two unique_ptrs would have ownership), so you can only move it. Note, however, that your current use of unique_ptr is incorrect. You cannot … Read more

Is std::unique_ptr required to know the full definition of T?

Adopted from here. Most templates in the C++ standard library require that they be instantiated with complete types. However shared_ptr and unique_ptr are partial exceptions. Some, but not all of their members can be instantiated with incomplete types. The motivation for this is to support idioms such as pimpl using smart pointers, and without risking … Read more