array/parray: add erase function

array/parray.hpp

@@ -80,6 +80,30 @@ namespace cruft {
         SizeT size (void) const;
         bool empty (void) const { return size () == 0; }
 
+        template <
+            typename T = DataT,
+            typename = std::enable_if_t<std::is_move_assignable_v<T>>
+        >
+        DataT*
+        erase (DataT *first, DataT *last)
+        {
+            DataT *newend = std::move (last, m_data + m_size, first);
+            for (auto cursor = newend; cursor != end (); ++cursor)
+                cursor->~DataT ();
+            m_size = cruft::cast::lossless<SizeT> (newend - m_data);
+            return newend;
+        }
+
+        template <
+            typename T = DataT,
+            typename = std::enable_if_t<std::is_move_assignable_v<T>>
+        >
+        DataT*
+        erase (DataT *item)
+        {
+            return erase (item, item + 1);
+        }
+
     private:
         SizeT  m_size;
         DataT *m_data;