Debug build fails with MSVC 14.51: stdext::checked_array_iterator removed #12

Three public headers use the MSVC extension stdext::checked_array_iterator when _ITERATOR_DEBUG_LEVEL is non-zero, which is the default in Debug builds:

• Release/include/cpprest/containerstream.h
• Release/include/cpprest/producerconsumerstream.h (two places)
• Release/include/cpprest/rawptrstream.h (two places)

The MSVC standard library deprecated stdext::checked_array_iterator in VS 2022 17.8, and MSVC Build Tools v14.51 has removed it. So Debug builds of cpprestsdk, and of consumers that include these headers, fail with v14.51:

containerstream.h(404,39): error C2653: 'stdext': is not a class or namespace name

Earlier toolsets report deprecation warning C4996, which also fails when warnings are errors.

Proposed Fix

Apply microsoft/cpprestsdk#1836, open upstream, which removes the uses (+1 −26). It follows an MSVC STL maintainer's advice to remove the uses rather than copy the extension, and it supersedes #1769.

The Debug jobs in Windows CI, on VS 2026 and VS 2022, check the change.

References

• microsoft/cpprestsdk#1768 ("stdext::checked_array_iterator compilation error with VS 2022 17.8 Preview 2")
• microsoft/cpprestsdk#1842 ("Cannot be used with MSVC C++ toolset 14.51.36014"), closed without a fix when upstream was archived
• microsoft/cpprestsdk#1836

Part of #15.