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Document MSVC macro _MSVC_LANG for future use in fl_attr.h

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This macro defines the C++ standard used by the compiler since
Visual Studio 2015 Update 3.
This commit is contained in:
Albrecht Schlosser
2023-02-06 23:03:45 +01:00
parent 160eb2926d
commit 9f8b65a70e
1 changed files with 18 additions and 5 deletions
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FL/fl_attr.h
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@@ -63,12 +63,25 @@
/* /*
Declare macros specific to Visual Studio. Declare macros specific to Visual Studio.
Visual Studio defines __cplusplus = '199711L' in all its versions which is Visual Studio defines __cplusplus = '199711L' in all its versions which is
not helpful for us here. For VS version number encoding see: not helpful for us here. For VS version number encoding see:
https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros
*/
This document specifies that the macro _MSVC_LANG is defined since
"Visual Studio 2015 Update 3" as 201402L (default) and undefined in
earlier versions. It can be used to determine the C++ standard as
specified by the /std:c++ compiler option:
- /std:c++14 201402L (also if /std:c++ is not used)
- /std:c++17 201703L
- /std:c++20 202002L
- /std:c++latest a "higher, unspecified value" (docs of VS 2022)
As of this writing (02/2023) _MSVC_LANG is not yet used in this file
but it is documented for future use.
*/
#if defined(_MSC_VER) #if defined(_MSC_VER)