FlatBuffers is a cross-platform serialization library designed for performance-critical applications that require efficient, zero-copy data access. By organizing data in a structured binary format, it allows applications to read and write complex data structures directly from memory-mapped buffers without the need for intermediate parsing or temporary object allocation.
The project distinguishes itself through a schema-driven approach that balances high-performance access with long-term data evolution. It utilizes a unique memory layout featuring relative offsets and inline fixed-size structures, which ensures that data remains position-independent and cache-friendly. To maintain compatibility as data requirements change, the system employs a table-based format that allows for the addition or deprecation of fields without breaking existing readers. Furthermore, it supports polymorphic data through union-type tagged offsets, providing a flexible yet strictly typed mechanism for handling varied data structures.
Beyond its core serialization capabilities, the project provides a comprehensive ecosystem for cross-language interoperability. It includes a schema compiler that generates native source code for a wide range of programming languages, enabling type-safe access to binary data across disparate systems. The library also offers dynamic, schema-less serialization options for scenarios requiring greater flexibility, alongside robust tooling for data format conversion and build system integration.
The project is distributed with extensive support for major build systems and package managers, facilitating integration into diverse development environments. Its documentation and tooling support the entire lifecycle of data contract development, from initial schema definition to cross-platform deployment.
