C++ String Conversion: Exploring std:from_chars in C++17 to C++26

1. ryu

   1 14 1,231 5.2 C++

   Converts floating point numbers to decimal strings (by ulfjack)

   

   I believe the impl you link to is not fully standards compliant, so just calls back to

   MSFT's one is totally standards compliant and it is a very different beast: https://github.com/microsoft/STL/blob/main/stl/inc/charconv

   Apart from various nuts and bolts optimizations (eg not using locales, better cache friendless, etc...) it also uses a novel algorithm which is an order of magnitude quicker for many floating points tasks (https://github.com/ulfjack/ryu).

   If you actually want to learn about this, then watch the video I linked earlier.

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3. fast_int

   2 1 2 4.0 C++

   Header-only C++11 implementation of the C++17 `from_chars` functions for integer types

   

   I wrote this library once; https://github.com/ton/fast_int.

   Removed `std::atoi` from the benchmarks since it was performing so poorly; not a contender. Should be easy to verify.

4. STL

   3 162 10,481 9.6 C++

   MSVC's implementation of the C++ Standard Library.

   

   I believe the impl you link to is not fully standards compliant, so just calls back to

   MSFT's one is totally standards compliant and it is a very different beast: https://github.com/microsoft/STL/blob/main/stl/inc/charconv

   Apart from various nuts and bolts optimizations (eg not using locales, better cache friendless, etc...) it also uses a novel algorithm which is an order of magnitude quicker for many floating points tasks (https://github.com/ulfjack/ryu).

   If you actually want to learn about this, then watch the video I linked earlier.

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