Deleted functions

You can delete functions to prevent them from beeing used. This is mostly used to prevent a type from being copied ; for example std::unique_ptr can't be copied because there can only be one owner of the data, unlike std::shared_ptr.

It can be done with the =delete syntax:

class MyClass{
    //...
    MyClass(const MyClass&) = delete; // delete the copy constructor
    MyClass& operator=(const MyClass&) = delete; // delete the copy assignment
    //...
};