ceph/src/boost/libs/metaparse/doc/get_result.qbk

   1 [#get_result]
   2 [section get_result]
   3
   4 [h1 Synopsis]
   5
   6   template <class D>
   7   struct get_result;
   8
   9 This is a [link lazy_metafunction lazy template metafunction].
  10
  11 [table Arguments
  12   [[Name] [Type]]
  13   [[`D`]  [[link accept accept] value]]
  14 ]
  15
  16 [h1 Description]
  17
  18 Returns the result information of a parsing result.
  19
  20 [h1 Header]
  21
  22   #include <boost/metaparse/get_result.hpp>
  23
  24 [h1 Example]
  25
  26   #include <boost/metaparse/get_result.hpp>
  27   #include <boost/metaparse/start.hpp>
  28   #include <boost/metaparse/accept.hpp>
  29   #include <boost/metaparse/string.hpp>
  30
  31   using namespace boost::metaparse;
  32
  33   struct returns_accept
  34   {
  35     using type =
  36       accept<
  37         std::integral_constant<int, 13>,
  38         BOOST_METAPARSE_STRING("foo"),
  39         start
  40       >;
  41   };
  42
  43   static_assert(
  44     get_result<
  45       accept<
  46         std::integral_constant<int, 13>,
  47         BOOST_METAPARSE_STRING("foo"),
  48         start
  49       >
  50     >::type::value == 13,
  51     "It should return the result of parsing"
  52   );
  53
  54   static_assert(
  55     get_result<returns_accept>::type::value == 13,
  56     "It should support lazy evaluation"
  57   );
  58
  59 [endsect]
  60