Thread: pass by referrence

  1. #1

    pass by referrence

    For clarity, when I pass by referrence like this:

    class Something
       int i;
       char c[20];
       long l;
       float f;   
    void DoSomething(Something &something);
    the overhead is the same as if I passed a pointer like this:

    void DoSomething(Something *something);

    as opposed to if I pass by value like this:

    void DoSomething(Something something);
    in which case the overhead is sizeof(Something).
    Is that all correct?

  2. #2
    looking for the truth moemen ahmed's Avatar
    Join Date
    Feb 2002
    C++ programmers strongly prefer references to pointers. References are cleaner and easier to use, and they do a better job of hiding information.

    References cannot be reassigned, however. If you need to point first to one object and then another, you must use a pointer. References cannot be null, so if there is any chance that the object in question may be null, you must not use a reference. You must use a pointer

    this was borrowed from "teach yourself c++ in 21 days"

    while passing by value is another story, as it copy the value to a new variable of the same type and let the function deal with the copy not with the original variable, so it doesnt affect the original variable you pass to it

    i hope its clear for u
    Programming is a high logical enjoyable art for both programer and user !!

  3. #3
    samurai warrior nextus's Avatar
    Join Date
    Nov 2001
    passing by value is sometimes bad for an struct, or class

    1) if the object is big...OUCH! (inheritance..etc..)

    2) it can all the default constructor forever..i mean forever!

    that is all..
    nextus, the samurai warrior

  4. #4
    Programming Sex-God Polymorphic OOP's Avatar
    Join Date
    Nov 2002
    yes, passing by reference and passing by pointer have exactly the same overhead. they will do the same thing internally by the compiler.

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