Foundation libraries for programming in C/C++ —
event loop, async I/O, channels, TLS, fibers, and more.

auto [tx, rx] = xpp::sync::mpsc::channel<int>(8);

// Consumer task — drains the channel, prints sum
auto consumer = xpp::spawn([rx = std::move(rx)]() -> xpp::Promise<void> {
  int sum = 0;
  while (auto val = co_await rx.recv()) {
    sum += val.unwrap();           // suspends until data arrives
  }
  printf("sum: %d\n", sum);        // 210
});

// Two producer tasks send concurrently over the same channel
auto p1 = xpp::spawn([tx]() -> xpp::Promise<void> {
  for (int i =  1; i <= 10; i++) co_await tx.send(i);
});
auto p2 = xpp::spawn([tx]() -> xpp::Promise<void> {
  for (int i = 11; i <= 20; i++) co_await tx.send(i);
});

// Wait for producers, then signal consumer
xpp::all(std::move(p1), std::move(p2))
    .then([tx = std::move(tx)]() mutable { tx.close(); })
    .await();

consumer.await();

co_await suspends the spawned task — waker-driven, so the event loop keeps churning.
Prefer .then() chains (C++11)? Prefer fibers + .await()? Same Promise<T>, your call.

Libraries

Library	Language	Description
libxpp	C++11	Stackful fibers, Promise<T>, channels, I/O combinators, smart pointers
libx	C99	Event loop, async I/O, HTTP/2, WebSocket, WebRTC, P2P, DNS, filesystem

Quick Start

# macOS
brew install googletest llhttp nghttp2 libusrsctp

# Linux
sudo apt install cmake libgtest-dev libnghttp2-dev libssl-dev libusrsctp-dev

cmake -B build && cmake --build build -j
cd build && ctest

CMake Options

Option	Default	Description
X_BUILD_STATIC	OFF	Build static libraries
X_BUILD_TESTS	ON	Build tests
X_TLS_BACKEND	auto	TLS backend: auto, openssl, mbedtls, none
X_DEBUG_LEVEL	0	Debug log verbosity (0–3)
XPP_MT	ON	Multi-threading support (Shared → Arc, atomic channels)
XPP_FIBER	ON	Stackful fiber scheduling for Promise::await()
CMAKE_CXX_STANDARD	20	C++ standard (11 for pure callback/fiber, 20 for co_await)

Documentation

See GitHub Pages for module-level API reference.

License

MIT