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learn-build-service-prod merged 7 commits into from
Nov 10, 2023
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Repo sync for protected branch #4810

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conformance for 17.7 and 17.8
Nov 9, 2023
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acrolinx
Nov 9, 2023
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tech review
Nov 9, 2023
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Merge pull request #5101 from TylerMSFT/conformance
prmerger-automator[bot] Nov 9, 2023
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Merge pull request #5103 from MicrosoftDocs/main
PhilKang0704 Nov 10, 2023
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Merging changes synced from https://github.com/MicrosoftDocs/cpp-docs…
Nov 10, 2023
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TylerMSFT TylerMSFT
TylerMSFT authored and TylerMSFT committed Nov 9, 2023
commit f9cd2bd283792fd5d6f30f024a01b419eea3ead7
8 changes: 4 additions & 4 deletions docs/overview/cpp-conformance-improvements.md
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Expand Up @@ -34,7 +34,7 @@ Visual Studio 2022 version 17.7 contains the following highlighted conformance i

The `<print>` library is now supported. See [P2093R14 Formatted output](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2093r14.html).

Improved how `views::cartesian_product` detects ranges with maximum sizes that are known at compile time.
Implemented `views::cartesian_product`.

### `using` conformance

Expand Down Expand Up @@ -306,9 +306,9 @@ bidi.cpp(8): warning C5255: unterminated bidirectional character encountered: 'U

### `from_chars()` `float` tiebreaker

Visual Studio 2022 version 17.2 fixes a bug in `<charconv>` `from_chars()` `float` tiebreaker rules that produced incorrect results. This bug affected decimal strings that were at the exact midpoint of consecutive `float` values, within a narrow range. (The smallest and largest affected values were `32768.009765625` and `131071.98828125`, respectively.) The tiebreaker rule wanted to round to "even", and "even" happened to be "down", but the implementation incorrectly rounded "up". (`double` was unaffected.) For more information and implementation details, see [microsoft/STL#2366](https://github.com/microsoft/STL/pull/2366).
Visual Studio 2022 version 17.2 fixes a bug in `<charconv>` `from_chars()` `float` tiebreaker rules that produced incorrect results. This bug affected decimal strings that were at the exact midpoint of consecutive `float` values, within a narrow range. (The smallest and largest affected values were `32768.009765625` and `131071.98828125`, respectively.) The tiebreaker rule wanted to round to "even," and "even" happened to be "down", but the implementation incorrectly rounded "up." (`double` was unaffected.) For more information and implementation details, see [microsoft/STL#2366](https://github.com/microsoft/STL/pull/2366).

This change affects runtime behavior in the specified range of cases.
This change affects runtime behavior in the specified range of cases:

#### Example

Expand Down Expand Up @@ -474,7 +474,7 @@ int main(void)

### Error on a nondependent `static_assert`

In Visual Studio 2022 version 17.1 and later, if the expression associated with a `static_assert` isn't a dependent expression, the compiler evaluates the expression as soon as it's parsed. If the expression evaluates to `false`, the compiler emits an error. Previously, if the `static_assert` was within the body of a function template (or within the body of a member function of a class template), the compiler wouldn't perform this analysis.
In Visual Studio 2022 version 17.1 and later, if the expression associated with a `static_assert` isn't a dependent expression, the compiler evaluates the expression when it is parsed. If the expression evaluates to `false`, the compiler emits an error. Previously, if the `static_assert` was within the body of a function template (or within the body of a member function of a class template), the compiler wouldn't perform this analysis.

This change is a source breaking change. It applies in any mode that implies **`/permissive-`** or **`/Zc:static_assert`**. This change in behavior can be disabled by using the **`/Zc:static_assert-`** compiler option.

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