LilyPond Internals Reference: 1.1.9 BarCheck

### 1.1.9 BarCheck

Check whether this music coincides with the start of the measure.

Properties:

> `iterator-ctor` (procedure):

>   `ly:bar-check-iterator::constructor`

>   Function to construct a `music-event-iterator` object for this music.

> `name` (symbol):

>   `'BarCheck`

>   Name of this music object.

> `types` (list):

>       '(bar-check)

>   The types of this music object; determines by what engraver this music expression is processed.

#### Internals Reference v2.22.2 (stable-branch).