FoundationDB's Flow: How Apple Built Actor-Based Concurrency Into C++11

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Apple's FoundationDB project uses a custom programming language called Flow to bring actor-based concurrency to C++11. Flow was developed internally to address the challenges of writing correct, high-performance distributed systems code. The language extends C++ with async/await-style constructs, allowing developers to write asynchronous code that reads like sequential logic. Apple has documented Flow's design and rationale on the official FoundationDB GitHub pages. The approach reflects a broader industry interest in making concurrent programming safer and more manageable within existing systems languages.

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