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20 lines
1.4 KiB
Markdown
20 lines
1.4 KiB
Markdown
# Grisu2
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This is a C++11 implementation of the Grisu2 algorithm for converting floating-point numbers to decimal strings.
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The Grisu2 algorithm is by Florian Loitsch, based on the work of Robert G. Burger and R. Kent Dybvig:
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- https://dl.acm.org/doi/10.1145/1806596.1806623 [1] Loitsch, "Printing Floating-Point Numbers Quickly and Accurately with Integers", Proceedings of the ACM SIGPLAN 2010 Conference on Programming Language Design and Implementation, PLDI 2010
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- https://dl.acm.org/doi/10.1145/231379.231397 [2] Burger, Dybvig, "Printing Floating-Point Numbers Quickly and Accurately", Proceedings of the ACM SIGPLAN 1996 Conference on Programming Language Design and Implementation, PLDI 1996
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The original C implementation is by Florian Loitsch:
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- https://drive.google.com/file/d/0BwvYOx00EwKmejFIMjRORTFLcTA/view?resourcekey=0-1Lg8tXTC_JAODUcFpMcaTA
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The implementation simplified and adapted to JSON and C++11 by Daniel Lemire as part of simdjson:
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- https://github.com/simdjson/simdjson/blob/master/src/to_chars.cpp
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The `grisu2.h` file is the same as `to_chars.cpp` but with `godot.patch` applied to it, with the following changes:
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- Simplify namespaces to just be one `grisu2` namespace.
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- Rename functions to ensure their names are unique.
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- Make `to_chars` handle both float and double types instead of just double.
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- Remove the trailing `.0` logic to match Godot's existing `String::num_scientific` behavior.
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