charport_classes: Registered charport ALTREP classes

In charport: ALTREP String Interoperability

Registered charport ALTREP classes

Description

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()

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.

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).

Examples

charport_classes()

charport documentation built on Sept. 21, 2026, 5:09 p.m.