Copy assignment operator
A copy assignment operator is a C++ special member function that copies state from one object into an already existing object of a compatible type.
100 C++ Mistakes and How to Avoid Them
A copy assignment operator is a C++ special member function that assigns the state of one existing object to another existing object of the same or compatible class.
- How it is used
- Maintains an existing object’s state while preserving class invariants during copying, resource management, inheritance, and chained assignment.
- How deep it goes
- Explains target state, member-wise copying, resource ownership, self-assignment, inheritance, return references, and default or deleted operators.
- Examples
- Uses containers, file readers, owning buffers, communication channels, derived students, complex numbers, and self-assigned automobiles.
- What you can do after
- Apply it via correctly written C++ operators that copy resources, support chaining, handle self-assignment, and update base-class state.
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Object-Oriented Software Design in C++
A C++ assignment operator that replaces an existing object's state with a copy of another object of the same or compatible type.
- How it is used
- Explains hidden object operations and controls whether classes may receive copied state.
- How deep it goes
- Shows self-assignment protection and explicit member copying, then traces performance consequences without developing move semantics.
- Examples
- Uses instrumented Date objects in an Appointments vector and a singleton ExecutivePass that deletes its copy assignment operator.
- What you can do after
- Evaluate/understand when assignment performs hidden copies and implement or disable copy assignment for a class design.
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Related concepts
- referenceuses · A reference is an indirect value or relationship that identifies or provides access to another value, object, resource, or source.
- initializationcontrasts with · Initialization is the process of establishing initial values or a starting state for a program entity, component, resource, or computation before subsequent operation.
- temporary objectuses · A temporary object is an unnamed object created for an intermediate expression or initialization whose lifetime is limited by language rules.
- copy constructorcontrasts with · A copy constructor is a constructor that initializes a new object from an existing object of the same class or type.
- deleted functionconfigured by · A deleted function is a C++ function explicitly declared unavailable, making attempts to call it ill-formed.
- deep copyuses · A deep copy is an independent duplicate of a data structure that recursively copies its nested objects rather than sharing mutable contents with the original.
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