Thread: objects + [copy]constructors + etc

  1. #1
    Registered User
    Join Date
    Jun 2004

    objects + [copy]constructors + etc

    Disclaimer: the following post is a ramble. Please feel free to comment on whatever part of it you wish

    I noticed that if I assign an enumeration variable to a fundamental type variable, it's disallowed:

    enum test{one} yo=one; int a=5; yo=a; //error
    however, if I pass an enumeration variable to a function which takes, say, an int, the type conversion is allowed and takes place. How and why does that work?

    Is that related to the case where you have a class, called for example test, and you initialize it like: test ob=5; ? Is that calling the copy constructor and converting int to type test? Is that calling the copy constructor at all? How is it different from test ob(5); ?

    thanks a bunch

  2. #2
    C/C++ homeyg's Avatar
    Join Date
    Nov 2004
    Louisiana, USA
    Any time a function is called, and anything is passed by value, the copy constuctor is called. However, I don't know how it converts the enumeration, though.

  3. #3
    Cat without Hat CornedBee's Avatar
    Join Date
    Apr 2003
    An enum is effectively only a group of named integral constants. Conversion to int just takes the numeric value of that constant.
    All the buzzt!

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
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