Clarify std::from_chars conversion method

lemire · web-flow · commit 64a68590fd3e · 2026-01-18T19:05:51.000-05:00
Updated explanation of `std::from_chars` conversion checks.
diff --git a/README.md b/README.md
@@ -69,7 +69,7 @@ int main() {
 }
 ```
 
-Though the C++17 standard has you do a comparison with `std::errc()` to check whether the conversion worked, you can avoid it by casting the result to a `bool` like so:
+Prior to C++26, checking for a successful `std::from_chars` conversion requires comparing the `from_chars_result::ec` member to `std::errc()`. As an extension `fast_float::from_chars` supports the improved C++26 API that allows checking the result by converting it to `bool`, like so:
 
 ```cpp
 #include "fast_float/fast_float.h"

Original file line number	Diff line number	Diff line change
`@@ -69,7 +69,7 @@ int main() {`
`69`	`69`	`}`
`70`	`70`	```
`71`	`71`
`72`		-Though the C++17 standard has you do a comparison with `std::errc()` to check whether the conversion worked, you can avoid it by casting the result to a `bool` like so:
	`72`	+Prior to C++26, checking for a successful `std::from_chars` conversion requires comparing the `from_chars_result::ec` member to `std::errc()`. As an extension `fast_float::from_chars` supports the improved C++26 API that allows checking the result by converting it to `bool`, like so:
`73`	`73`
`74`	`74`	```cpp
`75`	`75`	`#include "fast_float/fast_float.h"`