Refactor: Improve codecvt

[Flamefire]

Minor refactoring regarding consistency of types and improvement of the docu

No functional changes

[codecov[bot]]

Codecov Report

Merging #187 (601480a) into develop (2f08363) will increase coverage by 0.06%. The diff coverage is 97.05%.

:exclamation: Current head 601480a differs from pull request most recent head ca48301. Consider uploading reports for the commit ca48301 to get more accurate results

Additional details and impacted files

[](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) ```diff @@ Coverage Diff @@ ## develop #187 +/- ## =========================================== + Coverage 94.66% 94.72% +0.06% =========================================== Files 113 113 Lines 9851 9847 -4 =========================================== + Hits 9325 9328 +3 + Misses 526 519 -7 ``` | [Impacted Files](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) | Coverage Δ | | |---|---|---| | [include/boost/locale/utf.hpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9sb2NhbGUvdXRmLmhwcA==) | `98.72% <ø> (ø)` | | | [include/boost/locale/util.hpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9sb2NhbGUvdXRpbC5ocHA=) | `9.52% <0.00%> (ø)` | | | [include/boost/locale/generic\_codecvt.hpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9sb2NhbGUvZ2VuZXJpY19jb2RlY3Z0LmhwcA==) | `96.36% <100.00%> (+2.83%)` | :arrow_up: | | [include/boost/locale/utf8\_codecvt.hpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9sb2NhbGUvdXRmOF9jb2RlY3Z0LmhwcA==) | `94.44% <100.00%> (+0.32%)` | :arrow_up: | | [src/boost/locale/icu/codecvt.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-c3JjL2Jvb3N0L2xvY2FsZS9pY3UvY29kZWN2dC5jcHA=) | `79.16% <100.00%> (ø)` | | | [src/boost/locale/shared/date\_time.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-c3JjL2Jvb3N0L2xvY2FsZS9zaGFyZWQvZGF0ZV90aW1lLmNwcA==) | `86.63% <100.00%> (-0.19%)` | :arrow_down: | | [src/boost/locale/shared/iconv\_codecvt.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-c3JjL2Jvb3N0L2xvY2FsZS9zaGFyZWQvaWNvbnZfY29kZWN2dC5jcHA=) | `89.87% <100.00%> (ø)` | | | [src/boost/locale/util/codecvt\_converter.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-c3JjL2Jvb3N0L2xvY2FsZS91dGlsL2NvZGVjdnRfY29udmVydGVyLmNwcA==) | `94.07% <100.00%> (ø)` | | | [test/test\_codecvt.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-dGVzdC90ZXN0X2NvZGVjdnQuY3Bw) | `100.00% <100.00%> (ø)` | | | [test/test\_codepage\_converter.cpp](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-dGVzdC90ZXN0X2NvZGVwYWdlX2NvbnZlcnRlci5jcHA=) | `100.00% <100.00%> (ø)` | | ... and [6 files with indirect coverage changes](https://app.codecov.io/gh/boostorg/locale/pull/187/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Last update [2f08363...ca48301](https://app.codecov.io/gh/boostorg/locale/pull/187?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg).