Boost C++ Libraries

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Struct template extract

Struct template extract

boost::log::result_of::extract — A metafunction that allows to acquire the result of the value extraction.

Synopsis

// In header: <boost/log/attributes/value_extraction.hpp>

template<typename T, typename TagT> 
struct extract {
  // types
  typedef value_ref< T, TagT > type;
};

Description

The metafunction results in a type that is in form of value_ref< T, TagT >.