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What are requirements of classes whose objects are stored in container?

For C++ classes whose objects are stored inside containers like vectors, lists, deques, the following class items are generally required :

1. Constructors - naturally.

2. Copy Constructors - for creating objects that are stored inside the containers. These contained objects are actual copies of the originals that are inserted into the containers.

3. Destructors - naturally.

4. Assignment operator - needed especially when elements in the containers are removed (e.g. via the erase() method).

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This tip is provided by Mr. Lim Bio Liong, Original Tip could be found on this page.