p5.md

Sparrow Stage P5: Copying and Moving

In this stage, you'll create a NamedIntColumn type that has a string name and col that points to a IntColumn object (from last stage). You'll practice moving and copying in this project. Normally, name and col would be private, but you'll make them public for this project so that the tests can more easily verify you're doing the correct thing.

You should add this to sparrow.h:

  class NamedIntColumn {
  public:
    std::string name = "";
    IntColumn* col = nullptr;

    NamedIntColumn(const std::string& name, const std::vector<std::string>& inputs);
    NamedIntColumn(const NamedIntColumn& other);
    NamedIntColumn(NamedIntColumn&& other);
    void operator=(const NamedIntColumn& other);
    void operator=(NamedIntColumn&& other);
    ~NamedIntColumn();
  };

Then implement those functions in sparrow.cpp.

Assume that there is only ever one pointer from a NamedIntColumn to an IntColumn -- this means that a NamedIntColumn should delete the IntColumn (if there is one) upon its own destruction. It also means that copying a NamedIntColumn must involve copying the IntColumn as well.

When moving, the target NamedIntColumn should "steal" the pointer from other.col. Note that std::string also supports moving -- your move implementations should take advantage of that.