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ctype.h macros may conflict with C++11 UDL
- From: Glenn Elliott <glenn at aurora dot tech>
- To: newlib at sourceware dot org
- Date: Tue, 9 Oct 2018 18:03:27 -0700
- Subject: ctype.h macros may conflict with C++11 UDL
Hello newlib maintainers,
ctype.h “#define"s the following values: _U, _L, _N, _S, _P, _C, _X, and _B.
These macros may conflict with C++11 user defined literals (UDL) (https://en.cppreference.com/w/cpp/language/user_literal <https://en.cppreference.com/w/cpp/language/user_literal>). It’s easy to see how C++11 UDL suffixes might conflict it the macros defined in ctype.h. For instance, one may define a UDL function of “_N” to instantiate a C++ type that represents newtons of force. Indeed, this is done by this units library: https://github.com/nholthaus/units <https://github.com/nholthaus/units>
Must these macros leak from ctype.h?