Registered charport ALTREP classes — charport

Reports on the broker's ALTREP class registry. Registered classes are ALTREP character vector classes whose authors registered a reader with charport (via the `charport_register_altrep_v1` C entry point, fetched with `R_GetCCallable`). The reference `charvec` class is registered when `charport` loads, so a freshly loaded session normally reports at least that class.

Usage

charport_classes()

Value

A list with elements `n` (integer: number of registered classes), `persistent_views` (logical vector: whether returned byte views remain valid until the reader borrow ends), `concurrent_access` (logical vector: whether reader access calls may run concurrently), and `reentrant` (logical vector: whether both capabilities are true).

Details

ALTREP class names require an instance to query (R's `R_altrep_class_name` takes a vector, not a class descriptor), so this registry view reports the count and capability flags; use [charport_class_of()] on a vector to get its registered class name.

Examples

charport_classes()
#> $n
#> [1] 1
#> 
#> $persistent_views
#> [1] TRUE
#> 
#> $concurrent_access
#> [1] TRUE
#> 
#> $reentrant
#> [1] TRUE
#>