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merged 4 commits into from
Apr 10, 2024
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Repo sync for protected branch #5016

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5204760
clarify how macro value is set
Apr 9, 2024
2e67cbc
Merge pull request #5538 from TylerMSFT/github
prmerger-automator[bot] Apr 9, 2024
ebcccba
Merge pull request #5539 from MicrosoftDocs/FromPublicMasterBranch
Daidihuang Apr 10, 2024
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Merge pull request #5540 from MicrosoftDocs/main
Daidihuang Apr 10, 2024
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10 changes: 2 additions & 8 deletions docs/build/reference/std-specify-language-standard-version.md
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---
title: "/std (Specify Language Standard Version)"
description: "The MSVC compiler option /std specifies the C or C++ language standard supported by the compiler."
ms.date: 4/5/2023
ms.date: 4/9/2023
f1_keywords: ["/std", "-std", "/std:c++14", "/std:c++17", "/std:c++20", "/std:c11", "/std:c17", "/std:clatest", "VC.Project.VCCLCompilerTool.CppLanguageStandard"]
---
# `/std` (Specify Language Standard Version)
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The **`/std`** option in effect during a C++ compilation can be detected by use of the [`_MSVC_LANG`](../../preprocessor/predefined-macros.md) preprocessor macro. For more information, see [Preprocessor Macros](../../preprocessor/predefined-macros.md).

> [!IMPORTANT]
> Because some existing code depends on the value of the macro `__cplusplus` being 199711L, the MSVC compiler doesn't change the value of this macro unless you explicitly opt in by setting [`/Zc:__cplusplus`](zc-cplusplus.md). Here are the values for `__cplusplus` depending on the language version you are compiling with:
>
> | Language version | __cplusplus value |
> |------------------|-------------------|
> | `/std:c++14` | 201402 |
> | `/std:c++17` | 201703 |
> | `/std:c++20` | 202002 |
> Because some existing code depends on the value of the macro `__cplusplus` being `199711L`, the MSVC compiler doesn't change the value of this macro unless you explicitly opt in by setting [`/Zc:__cplusplus`](zc-cplusplus.md). Specify `/Zc:__cplusplus` and the **`/std`** option to set `__cplusplus` to the appropriate value.

**`/std:c++14`**\
The **`/std:c++14`** option enables C++14 standard-specific features implemented by the MSVC compiler. This option is the default for code compiled as C++. It's available starting in Visual Studio 2015 Update 3.
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