1 files changed, 26 insertions, 0 deletions
diff --git a/collection.h b/collection.h
new file mode 100644
index 0000000..e354065
--- /dev/null
+++ b/collection.h
@@ -0,0 +1,26 @@
+#ifndef _COLLECTION_H_
+#define _COLLECTION_H_
+
+class Collection
+{
+  public:
+    virtual ~Collection() {}
+
+    virtual void add(int) = 0;
+    virtual bool remove(int) = 0;
+    virtual Collection& operator=(const Collection&) = 0;
+    virtual int operator[](int) = 0;
+    virtual Collection *copy(void) = 0;
+
+    int get_size(void) const;
+    void iterate(void (*)(int *));
+    virtual bool contains(int) const;
+
+  private:
+  protected:
+    Collection() : size_(0) {}
+    int size_;
+};
+
+#endif
+