Overloaded Assignment Operator

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However, it is invoked implicitly when something is done that causes a COPY of an existing object to be created.

This happens when: Since the purpose of a copy constructor is to not only initialize the data in an object, but to initialize it as a copy of another existing object, the original object must be passed in as a parameter.

The explanations of the various constructs employed are given in the sections following.

I suspect what you meant to ask is: “When is it wise to explicitly define a copy and/or move assignment operator? The concise answer is: Whenever at least one of the following is true: Beware of claims that the answer depends on whether the class contains pointer members: That’s quite misleading.

If they both match the same, but are different functions, an ambiguity error results.

However for class types, identity assignment is not allowed.

This is sufficient for many cases, but not for ALL cases.

Example: This fraction object has a numerator of 3 and a denominator of 4.

I highly recommend the book “Elements of Programming” by Stepanov and Mc Jones.

Also look for presentations of Sean Parent on this topic.

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Comments Overloaded Assignment Operator

  • Operator - C# reference Microsoft Docs
    Reply

    Operator C# reference 06/21/2019; 2 minutes to read +2; In this article. The assignment operator = assigns the value of its right-hand operand to a variable, a property, or an indexer element given by its left-hand operand. The result of an assignment expression is the value assigned to the left-hand operand.…

  • Operator overloading -
    Reply

    Commonly overloaded operators have the following typical, canonical forms Assignment operator. The assignment operator operator = has special properties see copy assignment and move assignment for details. The canonical copy-assignment operator is expected to perform no action on self-assignment, and to return the lhs by reference…

  • Copy constructor vs assignment operator in C++ -
    Reply

    Assignment operator called Copy constructor called. Copy constructor is called when a new object is created from an existing object, as a copy of the existing object see this G-Fact. And assignment operator is called when an already initialized object is assigned a new value from another existing object.…

  • Overloading the assignment operator Learn C++
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    If a new object does not have to be created before the copying can occur, the assignment operator is used. Overloading the assignment operator. Overloading the assignment operator operator= is fairly straightforward, with one specific caveat that we’ll get to. The assignment operator must be overloaded as a member function.…

  • Assignment operator C++ - Wikipedia
    Reply

    In the C++ programming language, the assignment operator, =, is the operator used for 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.…

  • Operator overloading - C# reference Microsoft Docs
    Reply

    A user-defined type can overload a predefined C# operator. That is, a type can provide the custom implementation of an operation when one or both of the operands are of that type. The Overloadable operators section shows which C# operators can be overloaded. using System; public readonly struct.…

  • Operator Overloading in C++ - GeeksforGeeks
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    Assignment Operator Compiler automatically creates a default assignment operator with every class. The default assignment operator does assign all members of right side to the left side and works fine most of the cases this behavior is same as copy constructor. See this for more details.…

  • Assignment Operators Overloading in C++ -
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    You can overload the assignment operator = just as you can other operators and it can be used to create an object just like the copy constructor. Following example explains how an assignment operator can be overloaded.…

  • C++ Overloading assignment operator -
    Reply

    C++ Overloading Assignment Operator. C++ Overloading assignment operator can be done in object oriented programming. By overloading assignment operator, all values of one object i.e instance variables can be copied to another object. Assignment operator must be overloaded by a non-static member function only. If the overloading function for.…

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