Copy Constructors and reference objects

Plethora · 2013-04-03T10:26:36

My basic question here is: Is the following code doing what I think its doing? class Thing { private: std::vector<int> numbers; public: Thing(const Thing& thing2) { numbers = thing2.numbers; } } class Some_Other_Class } private: Thing &second; public: Some_Other_Class(Thing &thisThing) : second(thisThing); { } } int main() { Thing first; Some_Other_Class(first); } Sorry if this is overly complex but I wanted to replicate the structure of things in my program to make sure I'm asking the right question. Long story short, I want to have a reference to a "Thing" object that is passed into another (temporary) object. I don't want a copy, and I think I'm doing that much correctly, however, am I copying "numbers" or does the second instance of Thing contain a reference to "numbers" (which is my intent)?

For Beginners

Started by Plethora April 02, 2013 02:59 PM

10 comments, last by Rattenhirn 11 years ago

Plethora

687

Author

April 02, 2013 06:12 PM

Thanks for the help all, I think a new implementation is in order for me, one with fewer reference data members.

I think I'll also think through my examples a bit better next time. ;)

I'm working on a game! It's called "Spellbook Tactics". I'd love it if you checked it out, offered some feedback, etc. I am very excited about my progress thus far and confident about future progress as well!

http://infinityelephant.wordpress.com

Rattenhirn

3,115

April 03, 2013 10:26 AM

Rattenhirn is probably overlooking the mistake you likely made in your code where Some_Other_Class(first); does not create an unnamed temporary object, but a default constructed named object called first. I don't believe that is what you intended, and what Rattenhirn assumed.

Under the assumption that you intended to create a second object with a reference to the first object, then his explanation is correct.

ZOMG, totally missed that one. I learn something new every day!

Copy Constructors and reference objects

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Copy Constructors and reference objects

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