Packages · View as Markdown

Packages

Packages are directories with a Cplus.toml, source modules, and optional tests, documentation, link metadata, and platform variants. Add a package with cpc pm add; see Modules and packages and Package manager for resolution and manifest rules.

Core library and data

stdlib — collections, text, templates, paths, I/O, concurrency, async runtime pieces, files, networking, and platform shims.
appenv — cross-platform application directories (app_data_dir, cache_dir, no_backup_dir, resource_dir), staged asset readers (read_asset, read_asset_text, asset_path), and installed identity (app_id).
json — JSON parsing and serialization.
sqlite — Connection and Statement; raw bindings are available as sqlite/raw.
arena — growable bump allocator.
static_arena — fixed-capacity allocator stored in the value itself, with no heap allocation.
uuid and log — identifiers and structured logging.

facet — platform-neutral UI tree, elements, components, screens, services, hybrid_web page bridge, and navigation vocabulary.
facet_runtime — application entry point, named windows, routes, history, and backend installation.
facet_appkit — macOS backend.
facet_uikit — iOS backend (including iOS 26 Liquid Glass).
facet_android — Android backend (including Material 3 and Material You).
facet_gtk — GTK 4 backend for Linux.
facet_winui — default native WinUI 3 backend for Windows.
facet_win32 — deprecated Win32 backend (available only as an explicit opt-out via facet_runtime/win32::select()).
flex_layout — shared Flexbox, Grid, and responsive band layout engine.
inspector — mounted-tree inspection and editing for development.

Agent surface

agent_core — identities, exposure, capability grants, sensitivity tiers, outcomes, events, and backend interface.
facet_agent — optional agent integration for Facet applications across all five backends.
agent_mcp and agent_inapp — external JSON-RPC/MCP and in-process access.
agent_appkit, agent_uikit, agent_android, agent_gtk, and agent_winui — platform tree adapters (agent_win32 remains for standalone HWND trees and the Win32 opt-out; agent_winui_mcp and facet_agent_winui support standalone WinUI HTTP transport and forwarding).
agent_jwt — token verification for grant policies.

See Agent surface for the shared authorization model.

Native capabilities

notifications and applinks
camera, location, and sensors
biometrics, securestore, and permissions
filepicker, haptics, and share
http and fswatch
terminal — terminal screen model and native widgets on macOS and Linux.

Each package page records its platform coverage and explicit unsupported outcomes.

Platform bindings

Apple: appkit, uikit, foundation, quartzcore, metal, avfoundation, corelocation, coremotion, coreml, localauthentication, mapkit, vision, and webkit.
Linux/GTK: gtk4, adwaita, gobject, and their GLib/GIO/Cairo/Pango support packages (glib, gio, gmodule, gobject_gir, gdk, gdkpixbuf, gsk, graphene, cairo, pango, pangocairo, harfbuzz).
Windows: winui, winrt, and win32 (shell services and low-level Win32 bindings).
Android: android_view and jni.
Embedded: espidf.
Events: events.

Numerics, GPU, and AI

Real-time

rt — fixed pools, rings, and other primitives used with the compiler's real-time contracts.
rt_darwin — Darwin-specific real-time support.

Filter all 89 packages

accelerate Apple

C+ v0.0.30 package reference for accelerate.

adwaita Linux / GTK

C+ v0.0.30 package reference for adwaita.

agent_android Android

C+ v0.0.30 package reference for agent_android.

agent_appkit Apple

C+ v0.0.30 package reference for agent_appkit.

agent_core Agent

C+ v0.0.30 package documentation for agent_core.

agent_gtk Linux / GTK

The GTK 4 backend for the C+ agent surface on Linux: live widget-tree walking, grants, sensitivity policy, actions, events, and the common MCP vtable.