book: clarify that typeof is not a standard C++ feature#310
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typeof was presented as a familiar feature, but it is a non-standard extension (GCC/Clang) that was only standardized in C23 and has never been part of standard C++. Add a clarifying note in both languages. Fixes #286
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typeofwas presented as a familiar feature, but it is a non-standard extension (GCC/Clang) that was standardized only in C23 and has never been part of standard C++. Add a clarifying note in both languages.Fixes #286