sophec/__cplusplus values.md

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__cplusplus values for each C++ standard version

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__cplusplus values.md

Since it's impossible to find one concise source anywhere, as far as I can tell:

C++98: 199711L
C++11: 201103L
C++14: 201402L
C++17: 201703L
C++20: 202002L
C++23: 202302L

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