Use C++20 for ""_s if available#521
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In C++20, we are supposed to use CTAD NTTPs to implement string UDL templates. Continue to use BOOST_HANA_CONFIG_ENABLE_STRING_UDL to indicate that the string UDL template is available, but enable that macro by default if C++20 is detected.
This was referenced Mar 12, 2025
-Wdeprecated-literal-operator from clang++-20 for 'operator"" _c' (i.e. with space)
boostorg/yap#112
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In C++20, we are supposed to use CTAD NTTPs to implement string UDL templates.
Continue to use BOOST_HANA_CONFIG_ENABLE_STRING_UDL to indicate that the string UDL template is available, but enable that macro by default if C++20 is detected.
Compiler support detection is a bit involved, unfortunately, since there isn't a specific feature test macro for it and it appears to have been added in point releases for some compilers.