#C++ copy constructor game code
If you implement either one, we recommend that you also implement the other one so that the meaning of the code is clear. Declaring a copy constructor does not suppress the compiler-generated copy assignment operator, nor vice versa. If you do not declare a copy assignment operator, the compiler generates a member-wise copy assignment operator for you. If you do not declare a copy constructor, the compiler generates a member-wise copy constructor for you. The preceding code could mean "copy the contents of FILE1.DAT to FILE2.DAT" or it could mean "ignore FILE2.DAT and make b a second handle to FILE1.DAT." You must attach appropriate copying semantics to each class, as follows.īy using the assignment operator operator= together with a reference to the class type as the return type and the parameter that is passed by const reference-for example ClassName& operator=(const ClassName& x). For example, consider this code: TextFile a, b You can define the semantics of "copy" for objects of class type. Initialization: Initialization occurs when a new object is declared, when arguments are passed to functions by value, or when values are returned from functions by value. For information about move assignment, see Move Constructors and Move Assignment Operators (C++).īoth the assignment operation and the initialization operation cause objects to be copied.Īssignment: When one object's value is assigned to another object, the first object is copied to the second object. In this article "assignment" means copy assignment unless explicitly stated otherwise. Starting in C++11, two kinds of assignment are supported in the language: copy assignment and move assignment.
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