2955. to_chars / from_chars depend on std::string

Section: 23.2 [utility] Status: Resolved Submitter: Jens Maurer Opened: 2017-04-11 Last modified: 2017-07-17

Priority: Not Prioritized

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Discussion:

We added from_chars_result and to_chars_result into <utility>, but those contain error_code instances, which come from <system_error>. This creates a circular dependency issue which is somewhat difficult to resolve, as error_code depends on error_category which has virtuals that return string — it would effectively force putting all of <string> into <utility>.

Since (I believe) nobody has implemented this yet, would there be support for changing the member of from_chars_result / to_chars_result to an errc instead of an error_code (as a fast-track DR against 17)?

[2017-06-27, Jens comments]

The paper P0682R0 "Repairing elementary string conversions" is available in the pre-Toronto mailing and provides wording.

[2017-07 Toronto]

Resolved by the adoption of P0682R1 in Toronto.

Proposed resolution: