Does `std::vector::push_back()` Copy Objects?

Does std::vector Copy Objects with push_back?

After conducting extensive investigations using Valgrind, it has been suggested that std::vector creates a copy of any object pushed back into the vector. Is this assertion accurate? Can a vector not maintain a reference or pointer to an object without copying it?

Answer:

Yes, std::vector::push_back() indeed creates a copy of the supplied argument and adds it to the vector. If you intend to store pointers to objects within the vector, employ std::vector rather than std::vector.

However, you must guarantee that the objects referenced by the pointers remain valid while the vector maintains a reference to them. Smart pointers based on the RAII idiom offer a solution to this problem.

The above is the detailed content of Does `std::vector::push_back()` Copy Objects?. For more information, please follow other related articles on the PHP Chinese website!