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# The C+ Manual

C+ compiles to native code through LLVM. It has no garbage collector, no exceptions, no closures, no overloading, no implicit conversions, and no `null`. Memory is managed manually and checked through ownership and borrowing rules, with C ABI compatibility in both directions.

This manual documents **C+ 0.0.28**. The source of truth for behavior is the tagged compiler and package tree at [`v0.0.28`](https://github.com/netdur/cplus/tree/v0.0.28).

## Start here

- [Getting started](/docs/getting-started) installs the toolchain and builds the first program.
- [A tour of C+](/docs/tour) walks through a complete project in one sitting.
- [The C+ guide](/docs/guide) covers the judgment calls that syntax alone does not answer.
- [Language reference](/docs/reference) lists the complete surface compactly.
- [Language specification](/docs/spec) records the normative rules.
- [C+ 0.0.28 release notes](/docs/release-notes) record every shipped change and migration item.
- [Reproducible proofs](/prove) link claims to programs and commands that exercise them.

## Platforms in 0.0.28

C+ programs run across seven supported platform families:

```text
macos  linux  windows  ios  android  esp32  wasm
```

The native `cpc` toolchain runs on macOS, Linux, and Windows. It self-links executables on those hosts and cross-compiles static libraries and headers for iOS, Android, and ESP32. The `wasm` platform is used through `cpc-wasm`; it is not a native `cpc --target` value. See [Platforms and targets](/docs/targets) for target names and artifact behavior.

Facet has native backends for the supported application platforms:

| Platform | Facet backend | Status in 0.0.28 |
|---|---|---|
| macOS | [facet_appkit](/docs/packages/facet_appkit) | Supported |
| iOS | [facet_uikit](/docs/packages/facet_uikit) | Supported; simulator exercised, device build available |
| Android | [facet_android](/docs/packages/facet_android) | Supported |
| Linux | [facet_gtk](/docs/packages/facet_gtk) | Supported |
| Windows | [facet_win32](/docs/packages/facet_win32) | Supported |

Facet applications use [facet_runtime](/docs/packages/facet_runtime): register windows with `app.window(name, factory, chrome:)`, register routes on each window, and start the application with `App::run`. The pre-0.0.28 `app.screen`, `Screen::chrome`, `runtime::Window`, and global content-navigation APIs have been removed.

## What changed in 0.0.28

- Applications use the package `entry` key; `[[bin]]` and `[lib]` were removed. C-facing library products use `[library]`.
- `async fn main` and async `#[test]` are driven by the compiler. Synchronous callers consume futures with `.wait()` or `future::wait_or_cancel`; `executor::block_on` and `executor::run` were removed.
- `guard let` complements use `else Pattern`, without pipe delimiters.
- Facet application/runtime and agent integration moved into the `facet_runtime` and `facet_agent` packages.
- `sqlite/raw` replaces the separate `sqlite_ffi` package, `static_arena` replaces `static-arena`, and `terminal/backend` replaces `terminal/appkit`.
- `cpc query complete`, MCP `complete_at`, and LSP completion share the same compiler implementation. LSP and MCP retain a warm project session.
- The package manager supports exact tagged dependencies, a per-user package store, local overrides, and Android Maven/AAR dependency resolution.
- Native capability packages cover notifications, application links, camera, location, sensors, biometrics, secure storage, permissions, file picking, haptics, sharing, HTTP, and filesystem watching, with platform implementations or explicit unsupported outcomes.

## C plus packages

The language core supplies types, ownership, control flow, compilation, and the C ABI. The standard library, UI stack, platform bindings, services, data libraries, and numerical libraries live in packages. See the [package index](/docs/packages) and [modules and packages](/docs/modules-and-packages).

## Versioned manual

The clean `/docs` URLs always serve `Doc::CURRENT`. Frozen releases remain available under `/docs/{version}`. Every page also has a raw Markdown representation by appending `.md`; `/llms.txt` indexes the current manual and `/llms-full.txt` concatenates it.