This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++20 status.
__cpp_lib_to_charsSection: 17.3.1 [support.limits.general] Status: C++20 Submitter: S. B. Tam Opened: 2018-07-03 Last modified: 2022-08-23
Priority: 0
View all other issues in [support.limits.general].
View all issues with C++20 status.
Discussion:
After acceptance of P0941R2 into the working draft, in [support.limits.general],
__cpp_lib_to_chars is required to be in <utility>. Since the relevant feature
(std::to_chars and std::from_chars) is now in the header <charconv>,
should the macro be defined in <charconv> instead of <utility>?
[Marshall provides P/R and context]
std::to_chars, etc were originally proposed for the header <utility>
and SD-6 reflected that. Somewhere along the way, they was put into their own header
<charconv>, but the document was never updated to reflect that.
When these macros were added to the standard, the (now incorrect) value was copied as well.
[2018-07-20 Status to Tentatively Ready after five positive votes on the reflector.]
[2018-11, Adopted in San Diego]
Proposed resolution:
This wording is relative to (the Rapperswil post-mailing standard).
Change 17.3.1 [support.limits.general] (Table 35) as indicated:
| Macro name | Value | Header(s) |
|---|---|---|
__cpp_lib_to_chars | 201611L | <charconv |