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  1. #1
    Join Date
    Jan 2009

    [RESOLVED] Operator overloading - In class or global?

    I have two classes vmSize and vmPoint. Both have operator overloading functions, but mine are within the class. Looking at another developers implementation of both these classes, theirs are global?

    I do not understand what the benefits are making them global, can someone explain this to me?

    I do wonder if it has something to do with the fact that their Point class has an overloaded operator that takes a Size object?


    Point operator+ (const Point &pt, const Size &sz)
    What the mind can conceive it can achieve.

  2. #2
    Join Date
    Jan 2015

    Re: Operator overloading - In class or global?

    You may be interested in this article by Scott Meyers.

  3. #3
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Operator overloading - In class or global?

    If the lhs of the operator does not refer to the same class, then it has to be non-member.

    eg for a class A, A+B can be either member or non-member but B+A needs to be non-member. When there is a choice of using member or non-member see the article referred to in jlb1's post #2.

    PS How class functions are implemented (member vs non-member etc) really should be documented as part of in-house coding standards.
    Last edited by 2kaud; November 23rd, 2016 at 10:23 AM. Reason: PS
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