boost::log::formatters::named_scope
// In header: <boost/log/formatters/named_scope.hpp> template<typename CharT, typename... ArgsT> fmt_named_scope< CharT, no_throw_policy > named_scope(std::basic_string< CharT > const & name, ArgsT...const & args, std::nothrow_t const &);
Formatter generator. Construct the named scope formatter with the specified formatting parameters. The formatter will not throw if the attribute value is not found in the record being formatted. Instead, no output will be produced for this attribute value.
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