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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

The stdext Namespace 

Members of the <hash_map> and <hash_set> header files are not currently part of the ISO C++ standard. Therefore, these types and members have been moved from the std namespace to namespace stdext, to remain conformant with the C++ standard.

When compiling with /Ze, which is the default, the compiler will warn on the use of std for members of the <hash_map> and <hash_set> header files. To disable the warning, use the warning pragma.

To have 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 #include'ing any Standard C++ Library header files.

#define _DEFINE_DEPRECATED_HASH_CLASSES 0

When compiling with /Za, the compiler will generate an error.

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