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Coding Standards
This is an older version of Boost and was released in 2023. The current version is 1.89.0.
boost::log::expressions::format
// In header: <boost/log/expressions/formatters/format.hpp> template<typename CharT, typename TraitsT, typename AllocatorT> phoenix::actor< format_terminal< CharT > > format(std::basic_string< CharT, TraitsT, AllocatorT > const & fmt);