Create and Delete

We can construct each container using a multitude of constructors. To delete all elements of a container cont, use cont.clear(). It makes no difference if you create and delete a container or if we add and remove elements. Each time the container takes care of memory management.

The table shows the constructors and destructors of a container. All these functions can be used with std:vector.

Type	Example
Default	std::vector<int> vec1
Range	std::vector<int> vec2(vec1.begin(), vec1.end())
Copy	std::vector<int> vec3(vec2)
Copy	std::vector<int> vec3= vec2
Move	std::vector<int> vec4(std::move(vec3))
Move	std::vector<int> vec4= std::move(vec3)
Sequence (Initializer list)	std::vector<int> vec5 {1, 2, 3, 4, 5}
Sequence (Initializer list)	std::vector<int> vec5= {1, 2, 3, 4, 5}
Destructor	vec5.~vector()
Delete elements	vec5.clear()

Creation and deletion of a container

Because std::array is generated at compile-time, there are a few things that are special. std::array has no move constructor and can’t be created with a range or with an initializer list. However, an std::array can be initialized with an aggregate initialization. Also, std::array has no method for removing its elements.

Now we can use the different constructors on the different containers.