dart_cpp_bridge

Dart/Flutter ↔ C++20 binding generator, inspired by flutter_rust_bridge.

Write normal C++ code and call it from Dart/Flutter, with sync, async, stream, and Dart-closure reverse calls.

What's this?

• Write plain C++20 functions and classes — no hand-written FFI boilerplate
• Codegen generates Dart API + C++ wire dispatch from annotated headers
• Built-in runtime based on Asio + async-simple coroutines
• Supports Android, iOS, Windows, Linux, and macOS

Quickstart

See the documentation for a complete quickstart:

• English: deretame.github.io/dart_cpp_bridge/getting-started/
• 中文: deretame.github.io/dart_cpp_bridge/zh-cn/getting-started/

Show me the code

C++

#include <dart_cpp_bridge/annotate.h>

BRIDGE_SYNC int32_t add(int32_t a, int32_t b) { return a + b; }

BRIDGE_ASYNC
async_simple::coro::Lazy<std::string> greet(std::string name) {
  co_return "Hello, " + name;
}

Dart

import 'package:my_app/src/native_gen/api/api_fn.dart';

void main() async {
  await DcbLib.init();

  print(add(a: 1, b: 2));            // 3
  print(await greet(name: 'World')); // Hello, World
}

Documentation

• Homepage: deretame.github.io/dart_cpp_bridge/
• Quickstart: deretame.github.io/dart_cpp_bridge/getting-started/
• GitHub: github.com/deretame/dart_cpp_bridge

Acknowledgments

• Flutter Rust Bridge — architecture and product shape inspiration
• Asio — event loop and asynchronous I/O
• async-simple — C++20 coroutine runtime
• concurrentqueue — lock-free concurrent queue
• Dart / Flutter team — FFI, Isolate, NativeFinalizer, and the broader Dart native ecosystem

License

MIT — see LICENSE.