df579ce4b6
At the moment the ftm macro for __cpp_lib_to_chars will have the
following values:
standard_ftms: {
"c++17": "201611L",
"c++20": "201611L",
"c++23": "201611L",
"c++26": "201611L",
}
implemented_ftms: {
"c++17": None,
}
This is an issue with the test whether the FTM is implemented it does:
self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std]
This will fail in C++20 since implemented_ftms[ftm] does not have the
key c++20. This adds a new helper function and removes the None entries
when a FTM is not implemented.
---------
Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
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