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using a custom class inside a C++ vector

Started by moucard Jan 18, 2005 at 12:10 PM 1 replies 500+ views

Original Post

Jan 18, 2005 at 12:10 PM

Hi to everyone. I'm trying to remember what a class needs in order to be used properly as a vector object. I think it needed a copy constructor, a = operator and something else. What I want to do is simple:


class CMyObject {
  // define my object
};

..
vector<CMyObject> array;
..etc.

What are the prerequisites for CMyObject class? Thanks in advance.

Fruny

Jan 18, 2005 at 12:13 PM

Quote:
Original post by moucard
What are the prerequisites for CMyObject class? Thanks in advance.

Copy constructible and assignable. That's all.

If you have custom copy constructor and assignment operator, you generally also need a custom destructor.

SiCrane

Jan 18, 2005 at 12:18 PM

In order to be used as the held type of a standard container class, a type needs to by copy constructable and assignable. That is given an type T, and two objects t of type T and of type const T.

t = u must compile and have a return type T &
T(t) must compile
T(u) must compile
&t should yield a pointer of type T *
&u should yield a pointer of type const & *

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