boost::result_of::extract_or_throw< T, TagT > Struct Template Reference

A metafunction that allows to acquire the result of the value extraction. More...

#include <value_extraction_fwd.hpp>

Public Types
typedef mpl::if_ < mpl::is_sequence< T > , value_ref< T, TagT >, T const & >::type	type

Detailed Description

template<typename T, typename TagT>
struct boost::result_of::extract_or_throw< T, TagT >

A metafunction that allows to acquire the result of the value extraction.

The metafunction results in a type that is in form of T const&, if T is not an MPL type sequence, or value_ref< T, TagT > otherwise. In the latter case the value reference shall never be empty.

Member Typedef Documentation

template<typename T , typename TagT >

typedef mpl::if_< mpl::is_sequence< T >, value_ref< T, TagT >, T const& >::type boost::result_of::extract_or_throw< T, TagT >::type

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The documentation for this struct was generated from the following file:

• boost_1_57_0/boost/log/attributes/value_extraction.hpp