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In the C++ programming language, the assignment operator, =, is the operator used for assignment.Like most other operators in C++, it can be overloaded.. The copy assignment operator, often just called the "assignment operator", is a special case of assignment operator where the source (right-hand side) and destination (left-hand side) are of the same class type.
C and C++ have the same assignment operators and all can be overloaded in C++. For the combination operators, a ⊚= b (where ⊚ represents an operation) is equivalent to a = a ⊚ b, except that a is evaluated only once.
The move assignment operator, like most C++ operators, can be overloaded. Like the copy assignment operator it is a special member function. If the move assignment operator is not explicitly defined, the compiler generates an implicit move assignment operator (C++11 and newer) provided that copy/move constructors, copy assignment operator or ...
Only extant operators in the language may be overloaded, by defining new functions with identifiers such as "+", "*", "&" etc. Subsequent revisions of the language (in 1995 and 2005) maintain the restriction to overloading of extant operators. In C++, operator overloading is more refined than in ALGOL 68. [44]
For example, a prototype for an assignment operator that returns a type R!=T, where T is the type of the calling object is a wrong prototype. The build-in assignment operator returns a reference to the left-hand side operator, which has particular effects. Overloaded operators should implement an analogous interface.
Function overloading is usually associated with statically-typed programming languages that enforce type checking in function calls. An overloaded function is a set of different functions that are callable with the same name. For any particular call, the compiler determines which overloaded function to use and resolves this at compile time ...
In C++, by contrast, objects are copied automatically whenever a function takes an object argument by value or returns an object by value. Additionally, due to the lack of garbage collection in C++, programs will frequently copy an object whenever the ownership and lifetime of a single shared object would be unclear.
Assignment operator; Assignment operator (C++) Augmented assignment; B. Bitwise operation; ... Operator overloading; Operators in C and C++; Order of operations; P.