Improves Rust code generation (#8564) * Fixes checks for serde features in flexbuffers crate * Removes unused MapReaderIndexer use statement * Fixes warning about nightly cfg usage Enabling a cfg attribute through cargo::rustc-cfg in build.rs should be coupled with a cargo::rust-check-cfg value so that the compiler knows about the custom cfg. See: https://doc.rust-lang.org/rustc/check-cfg/cargo-specifics.html#cargorustc-check-cfg-for-buildrsbuild-script. * Migrates usage of deprecated float constants This update fixes a compiler warning from use of the old constants. Constants like EPSILON are now directly on the float primitives (e.g. f32::EPSILON) rather than in the f32 module (std::f32::EPSILON). The new constants have existed since 1.43.0, which appears to be below the MSRV for the flatbuffers crate. * Fixes incorrect key in flatbuffers Cargo.toml The old code was using package.rust, which triggered a warning about an unused key: warning: flatbuffers/rust/flatbuffers/Cargo.toml: unused manifest key: package.rust The correct key for specifying MSRV is rust-version. See: https://doc.rust-lang.org/cargo/reference/rust-version.html#rust-version. --------- Co-authored-by: Wouter van Oortmerssen <aardappel@gmail.com>
FlatBuffers
FlatBuffers is a cross platform serialization library architected for maximum memory efficiency. It allows you to directly access serialized data without parsing/unpacking it first, while still having great forwards/backwards compatibility.
Build the compiler for flatbuffers (flatc)
Use cmake to create the build files for your platform and then perform the compilation (Linux example).
cmake -G "Unix Makefiles" make -j
Define your flatbuffer schema (.fbs)
Write the schema to define the data you want to serialize. See monster.fbs for an example.
Generate code for your language(s)
Use the flatc compiler to take your schema and generate language-specific code:
./flatc --cpp --rust monster.fbs
Which generates monster_generated.h and monster_generated.rs files.
Serialize data
Use the generated code, as well as the FlatBufferBuilder to construct your serialized buffer. (C++ example)
Transmit/store/save Buffer
Use your serialized buffer however you want. Send it to someone, save it for later, etc...
Read the data
Use the generated accessors to read the data from the serialized buffer.
It doesn't need to be the same language/schema version, FlatBuffers ensures the data is readable across languages and schema versions. See the Rust example reading the data written by C++.
Go to our landing page to browse our documentation.
Code generation and runtime libraries for many popular languages.
FlatBuffers does not follow traditional SemVer versioning (see rationale) but rather uses a format of the date of the release.
flatbuffers tag for any questions regarding FlatBuffers.To contribute to this project, see CONTRIBUTING.
Please see our Security Policy for reporting vulnerabilities.
Flatbuffers is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.