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Merged
merged 6 commits into from
Jan 17, 2025
Merged

Repo sync for protected branch #5154

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3a6fd83
add note that behavior changed in 17.10
TylerMSFT Jan 16, 2025
e7b1654
Update docs/build/reference/zc-static-assert.md
TylerMSFT Jan 16, 2025
d0fce2b
Update docs/build/reference/zc-static-assert.md
TylerMSFT Jan 16, 2025
5724799
Merge pull request #5737 from TylerMSFT/zc
prmerger-automator[bot] Jan 16, 2025
a7c9dc0
Merge pull request #5740 from MicrosoftDocs/FromPublicMasterBranch
Albertyang0 Jan 17, 2025
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Merge pull request #5741 from MicrosoftDocs/main
Albertyang0 Jan 17, 2025
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6 changes: 4 additions & 2 deletions docs/build/reference/zc-static-assert.md
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---
description: "Learn more about: /Zc:static_assert (Strict static_assert handling)"
title: "/Zc:static_assert (Strict static_assert handling)"
ms.date: 12/15/2021
ms.date: 1/15/2025
f1_keywords: ["/Zc:static_assert"]
helpviewer_keywords: ["/Zc:static_assert compiler option (C++)"]
---
Expand All @@ -16,7 +16,9 @@ The **`/Zc:static_assert`** compiler option tells the compiler to evaluate `stat

## Remarks

The **`/Zc:static_assert`** compiler option tells the compiler to evaluate a `static_assert` in the body of a function template or in the body of a class template member function when first parsed, if the test expression isn't dependent. If the non-dependent test expression isn't `false`, the compiler emits an error immediately. When the test expression is dependent, the `static_assert` isn't evaluated until the template is instantiated.
Starting with Visual Studio 17.10, `/Zc:static_assert` and `/Zc:static_assert-` have no effect. Both options are ignored to avoid breaking builds that use them. `static_assert` is now never evaluated when parsing class or function templates.

The **`/Zc:static_assert`** compiler option tells the compiler to evaluate a `static_assert` in the body of a function template or in the body of a class template member function when first parsed, if the test expression isn't dependent. If the non-dependent test expression is `false`, the compiler emits an error immediately. When the test expression is dependent, the `static_assert` isn't evaluated until the template is instantiated.

The **`/Zc:static_assert`** option is available starting in Visual Studio 2022 version 17.1. In earlier versions of Visual Studio, or if **`/Zc:static_assert-`** is specified, Visual Studio doesn't do dependent analysis if the `static_assert` is within the body of a function template or within the body of a member function of a class template. Instead, it only evaluates the `static_assert` when a template is instantiated.

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