EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/metaparse/doc/repeated1.qbk

[#repeated1]
[section repeated1]

[h1 Synopsis]

  template <class P>
  struct repeated1;

This is a [link parser_combinator parser combinator].

[table Arguments
  [[Name] [Type]]
  [[`P`]  [[link parser parser]]]
]

[h1 Description]

It applies `P` on the input string repeatedly as long as the parser accepts the
input. The result of parsing is a sequence of the results of the individual
applications of `P`.

When `P` rejects the input for the first time, `repeated1` rejects it as well.
At least one successful application of `P` is required for `repeated1` to accept
the input.

[h1 Header]

  #include <boost/metaparse/repeated1.hpp>

[h1 Expression semantics]

For any `p` parser the following are equivalent:

  repeated1<p>
  
  last_of<look_ahead<p>, repeated<p>>

[h1 Example]

  #include <boost/metaparse/repeated1.hpp>
  #include <boost/metaparse/digit_val.hpp>
  #include <boost/metaparse/start.hpp>
  #include <boost/metaparse/string.hpp>
  #include <boost/metaparse/get_result.hpp>
  #include <boost/metaparse/is_error.hpp>
  
  #include <boost/mpl/equal.hpp>
  #include <boost/mpl/vector.hpp>
  #include <boost/mpl/int.hpp>
  
  using namespace boost::metaparse;
  
  using digits = repeated1<digit_val>;
  
  static_assert(
    boost::mpl::equal<
      get_result<digits::apply<BOOST_METAPARSE_STRING("1234"), start>>::type,
      boost::mpl::vector<
        boost::mpl::int_<1>,
        boost::mpl::int_<2>,
        boost::mpl::int_<3>,
        boost::mpl::int_<4>
      >
    >::type::value,
    "the result of parsing should be the list of digit values"
  );
  
  static_assert(
    is_error<digits::apply<BOOST_METAPARSE_STRING("x"), start>>::type::value,
    "repeated1 should reject the input when it can't parse anything with digit_val"
  );

[endsect]