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Update README with note for C users

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Added a note for C users to consider ffc.h for high-performance parsing.
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Daniel Lemire 2026-03-05 21:59:09 -05:00 committed by GitHub
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@ -3,6 +3,9 @@
[![Ubuntu 22.04 CI (GCC 11)](https://github.com/fastfloat/fast_float/actions/workflows/ubuntu22.yml/badge.svg)](https://github.com/fastfloat/fast_float/actions/workflows/ubuntu22.yml) [![Ubuntu 22.04 CI (GCC 11)](https://github.com/fastfloat/fast_float/actions/workflows/ubuntu22.yml/badge.svg)](https://github.com/fastfloat/fast_float/actions/workflows/ubuntu22.yml)
*Note: This library is for C++ users. C programmers should consider [ffc.h](https://github.com/kolemannix/ffc.h). It is a high-performance port of fast_float to C.*
The fast_float library provides fast header-only implementations for the C++ The fast_float library provides fast header-only implementations for the C++
from_chars functions for `float` and `double` types as well as integer types. from_chars functions for `float` and `double` types as well as integer types.
These functions convert ASCII strings representing decimal values (e.g., These functions convert ASCII strings representing decimal values (e.g.,
@ -10,6 +13,7 @@ These functions convert ASCII strings representing decimal values (e.g.,
even). In our experience, these `fast_float` functions many times faster than even). In our experience, these `fast_float` functions many times faster than
comparable number-parsing functions from existing C++ standard libraries. comparable number-parsing functions from existing C++ standard libraries.
Specifically, `fast_float` provides the following two functions to parse Specifically, `fast_float` provides the following two functions to parse
floating-point numbers with a C++17-like syntax (the library itself only floating-point numbers with a C++17-like syntax (the library itself only
requires C++11): requires C++11):