ceph/src/boost/libs/metaparse/doc/before_5_2_1.qbk

   1 [#before_5_2_1]
   2 ['Definitions before section 5.2.1.]
   3
   4   #include <boost/metaparse/string.hpp>
   5   #include <boost/metaparse/int_.hpp>
   6
   7   #include <boost/metaparse/build_parser.hpp>
   8
   9   using namespace boost::metaparse;
  10
  11   using exp_parser1 = build_parser<int_>;
  12   #include <boost/metaparse/entire_input.hpp>
  13
  14   using exp_parser2 = build_parser<entire_input<int_>>;
  15   #include <boost/metaparse/token.hpp>
  16
  17   using exp_parser3 = build_parser<entire_input<token<int_>>>;
  18   #include <boost/metaparse/lit_c.hpp>
  19
  20   #include <boost/metaparse/sequence.hpp>
  21
  22   using exp_parser4 = build_parser<sequence<token<int_>, token<lit_c<'+'>>, token<int_>>>;
  23
  24   #include <metashell/formatter.hpp>
  25
  26   using int_token = token<int_>;
  27
  28   using plus_token = token<lit_c<'+'>>;
  29
  30   using exp_parser5 = build_parser<sequence<int_token, plus_token, int_token>>;
  31   #include <boost/metaparse/transform.hpp>
  32
  33   #include <boost/mpl/plus.hpp>
  34
  35   #include <boost/mpl/at.hpp>
  36
  37   template <class Vector>
  38    struct eval_plus :
  39      boost::mpl::plus<
  40        typename boost::mpl::at_c<Vector, 0>::type,
  41        typename boost::mpl::at_c<Vector, 2>::type
  42      > {};
  43
  44   #include <boost/mpl/quote.hpp>
  45
  46   using exp_parser6 =
  47    build_parser<
  48      transform<
  49        sequence<int_token, plus_token, int_token>,
  50        boost::mpl::quote1<eval_plus>
  51      >
  52    >;
  53   #include <boost/metaparse/any.hpp>
  54
  55   using exp_parser7 =
  56    build_parser<
  57      sequence<
  58        int_token,                                /* The first <number> */
  59        repeated<sequence<plus_token, int_token>> /* The "+ <number>" elements */
  60      >
  61    >;
  62   using temp_result = exp_parser7::apply<BOOST_METAPARSE_STRING("1 + 2 + 3 + 4")>::type;
  63