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This is an older version of Boost and was released in 2023. The current version is 1.89.0.
boost::log::expressions::c_ascii_decor
// In header: <boost/log/expressions/formatters/c_decorator.hpp> unspecified c_ascii_decor;
C-style decorator generator object. Acts similarly to c_decor, except that c_ascii_decor also converts all non-ASCII and non-printable ASCII characters, except for space character, into C-style hexadecimal escape sequences. The generator provides operator[] that can be used to construct the actual decorator. For example:
c_ascii_decor[ stream << attr< std::string >("MyAttr") ]
For wide-character formatting there is the similar wc_ascii_decor decorator generator object.