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Note
The stdext namespace and the <hash_map> and <hash_set> headers were removed in MSVC Build Tools version 14.51.
Members of the <hash_map> and <hash_set> header files aren't currently part of the ISO C++ standard. To stay conformant with the C++ standard, the compiler moved these types and members from the std namespace to the stdext namespace.
When you compile with /Ze, which is the default, the compiler warns you if you use std for members of the <hash_map> and <hash_set> header files. To disable the warning, use the warning pragma.
To make the compiler generate an error for the use of std for members of the <hash_map> and <hash_set> header files with /Ze, add the following directive before you #include any C++ Standard Library header files.
#define _DEFINE_DEPRECATED_HASH_CLASSES 0
When you compile with /Za, the compiler generates an error.