C++ C2039和C2873，包括`<；cctype>；`从STL

我正在尝试用msvc 2019编译器编译一个项目，我知道这些编译器以前已经编译过了。事实上，我正在为它更新构建系统。我在使用标准模板库的源代码时遇到了一个奇怪的问题。基本上，该项目包括

，其中包含以下代码片段：

_STD_BEGIN
using _CSTD isalnum;
using _CSTD isalpha;
using _CSTD iscntrl;
using _CSTD isdigit;
using _CSTD isgraph;
using _CSTD islower;
using _CSTD isprint;
using _CSTD ispunct;
using _CSTD isspace;
using _CSTD isupper;
using _CSTD isxdigit;
using _CSTD tolower;
using _CSTD toupper;

using _CSTD isblank;
_STD_END

但是当我编译我的项目时，这些声明都与下面的错误有关

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(38): error C2039: 'isalnum': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(38): error C2873: 'isalnum': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(39): error C2039: 'isalpha': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(39): error C2873: 'isalpha': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(40): error C2039: 'iscntrl': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(40): error C2873: 'iscntrl': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(41): error C2039: 'isdigit': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(41): error C2873: 'isdigit': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(42): error C2039: 'isgraph': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(42): error C2873: 'isgraph': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(43): error C2039: 'islower': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(43): error C2873: 'islower': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(44): error C2039: 'isprint': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(44): error C2873: 'isprint': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(45): error C2039: 'ispunct': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(45): error C2873: 'ispunct': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(46): error C2039: 'isspace': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(46): error C2873: 'isspace': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(47): error C2039: 'isupper': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(47): error C2873: 'isupper': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(48): error C2039: 'isxdigit': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(48): error C2873: 'isxdigit': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(49): error C2039: 'tolower': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(49): error C2873: 'tolower': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(50): error C2039: 'toupper': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(50): error C2873: 'toupper': symbol cannot be used in a using-declaration
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(52): error C2039: 'isblank': is not a member of '`global namespace''
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\cctype(52): error C2873: 'isblank': symbol cannot be used in a using-declaration

结果与c++11和c++14相同。我试图制作一个最小的工作示例，但未能成功，因为我的玩具项目包含并使用

编译时没有问题。因此，我的项目设置肯定有问题

---

我知道这将是一个困难的问题，但是有人对这里可能发生的事情有任何想法吗？

在该头文件中，是否正确定义了

\u CSTD

宏？（它应该相当于

：

）。我认为这将涉及一些侦探式的错误根源追踪。困难的一个-查看预处理器输出如何？@AdrianMole我试图用常规名称空间声明手动替换宏，但我无法修改任何visual studio源文件，即使是作为管理员。@RichardCriten我正在处理它。我试着从一个玩具可执行文件中使用相同的库，但令人恼火的是，它起了作用。因此，为了查看预处理器输出，我必须编译主项目并筛选输出。（a）查找具有非唯一名称的保留#定义和头保护（这样头在不应该被排除时被排除）。（b） 签出最后一个良好的构建，角色将其转发，直到构建中断（如果需要，则进行二进制切碎）；希望这能让你少找些。