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boost::log::expressions::wrap_formatter
// In header: <boost/log/expressions/formatters/wrap_formatter.hpp> template<typename FunT> unspecified wrap_formatter(FunT const & fun);
The function wraps a function object in order it to be able to participate in formatting expressions. The wrapped function object must be compatible with the following signature:
void (record_view const&, basic_formatting_ostream< CharT >&)
where CharT is the character type of the formatting expression.