# `•storage` — Storage

`•storage Y` gives a record of how the items of `Y` are held. It reads
no items, and a pending call stays pending.

- `kind` names the storage: `"bool"`, `"integer"`, `"float64"`,
  `"float32"`, `"float16"`, `"complex128"`, `"complex64"`, `"character"`
  or `"mixed"`. An atom gives its own kind. That can also be
  `"rational"`, for an exact rational or an integer beyond 64 bits, or
  `"function"`. Compact storage holds items of one kind. `"integer"`
  covers integers of every width. Mixed storage keeps each item’s kind.
  Boxed display marks the same storage on its bottom edge.
  [Storage](../numbers.qmd#storage) describes each storage.
- `pending` is `$t` while fusion hasn’t yet run the call that computes
  the items.
- `view` is `$t` when `Y` reads another array’s items, as a reshape
  does.
- `active` counts the levels of `∂` whose tags `Y` carries. Under `∂`,
  `kind` names the storage of the value being differentiated.

``` bpl
•storage 1.5 2.5             ⍝ ["kind":"float64" "pending":$f "view":$f "active":0ₓ]
(•storage 2 3⍴⍳6ₓ).view       ⍝ $t
y←1.5+¿200000⍴0
(•storage y).pending         ⍝ $t
```