Custom Class Assignment Operator

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If you don't want a class to be copied, for example, you have to define an empty copy constructor and assignment operator yourself and make them private or protected.

Furthermore, the compiler isn't guaranteed to create versions of these classes that do exactly what you want them to do.

So the outer shell of a properly-written assignment operator would look like this: should be a virtual function. Many C programmers are trained to make everything virtual, and in fact, some older frameworks do just that.

In the specific example of the assignment operator, however, it's not a good idea.

If they have public data members (generally a bad idea), they have the same values.

This doesn't necessarily mean that the objects are identical: some purely internal data members (such as caches) might not be copied, or data members pointing to other objects might end up pointing to different objects that are themselves semantically equivalent, rather than pointing to the same objects.

This can be of any type, but the assignment operator that C automatically generates for you (and therefore, the one we're interested in here) is the one where you have the same type of object on both sides of the = sign.

That means the parameter is either an instance of or a reference to an instance of the same class as the object on the left-hand side.

The difference between the copy constructor and assignment operator is that the copy constructor is a constructor — a function whose job it is to turn raw storage into an object of a specific class.

An assignment operator, on the other hand, copies state between two existing objects.

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Comments Custom Class Assignment Operator

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    Operator Overloading Why Overload Operators. By implementing operators that are appropriate for your class, you can integrate objects of your class into the MATLAB ® language.…

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    If a class doesn’t contain pointers, then there is no need to write assignment operator and copy constructor. The compiler creates a default copy constructor and assignment operators for every class.…

  • Python custom assignment operator - Stonewall
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  • TalkAssignment operator C++ - Wikipedia
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    It works with default assignment operator and so it should with user-defined, unless constant return type is desired for a specific reason, of course. In such a case, it is a custom operator signature and goes beyond the topic, doesn't it?…

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    Overload the cast operator from custom class to int Overloads increment and decrement for the Box class, both the prefix and postfix forms Overload new, new, delete, and delete for the Box class.…

  • Copy assignment operator -
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    A copy assignment operator of class T is a non-template non-static member function with the name operator= that takes exactly one parameter.…

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    Since there are no assignment operators within the function, it doesn't perform any changes to its class members - so is the last const useless? My operator==Vector& function is pretty ugly. Any suggestions for a nicer/more efficient solution?…

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    An operator function can be either a nonstatic member function, or a nonmember function with at least one parameter that has class, reference to class, enumeration, or reference to enumeration type. You cannot change the precedence, grouping, or the number of operands of an operator.…

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    For example, the addition assignment operator += combines addition and assignment into a single operation. You mark a compound assignment operator’s left input parameter type as inout, because the parameter’s value will be modified directly from within the operator method.…

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