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Top 3 C++ Marshalling Projects
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Project mention: I wasted weeks hand optimizing assembly because I benchmarked on random data | news.ycombinator.com | 2025-07-24
(((uint32_t)clz + 7) * 9) >> 6
3. Hand roll a jump table taking advantage of arm's fixed instruction width to calculate the jump target with a shift.
https://github.com/protocolbuffers/protobuf/commit/b039dfe26...
This results in one branch for 1 byte varints, plus one additional branch for any larger size, and the branch predictor does not have to track a varying trip count through a loop. This approach resulted in a 2.64% speedup for overall encoding (which includes a lot more than just varints) on mid sized arm cores.
I think it's very difficult to beat a single comparison and branch for the 1 byte case for actual encoding forwards or backwards, unless you know there's going to be long runs of one-byte values.
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FlatBuffers, also developed by Google, is a highly optimized serialization library designed for scenarios where zero-copy deserialization is required.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Marshalling discussion
C++ Marshalling related posts
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FlatBuffers – an efficient cross platform serialization library for many langs
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Anyone has experience with reverse engineering flatbuffers?
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flatbuffers - FlatBuffers: Memory Efficient Serialization Library
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How do AAA studios make update-compatible save systems?
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FlatBuffers: FlatBuffers
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Is using Flatbuffers to parse sensor data a bad application of Flatbuffers?
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Help finding a transpiled-to-C language
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A note from our sponsor - Sevalla
sevalla.com | 1 Sep 2025
Index
What are some of the best open-source Marshalling projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Protobuf | 68,919 |
| 2 | FlatBuffers | 24,677 |
| 3 | cppbor | 14 |
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