ceph/src/boost/libs/spirit/doc/qi/num_list2.qbk

   1 [/==============================================================================
   2     Copyright (C) 2001-2011 Joel de Guzman
   3     Copyright (C) 2001-2011 Hartmut Kaiser
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ===============================================================================/]
   8
   9 [section Number List - stuffing numbers into a std::vector]
  10
  11 This sample demonstrates a parser for a comma separated list of numbers. The
  12 numbers are inserted in a vector using phoenix.
  13
  14 [import ../../example/qi/num_list2.cpp]
  15
  16 [tutorial_numlist2]
  17
  18 The full cpp file for this example can be found here: [@../../example/qi/num_list2.cpp]
  19
  20 This, again, is the same parser as before. This time, instead of summing up the
  21 numbers, we stuff them in a `std::vector`. `push_back` is supplied by
  22 __phoenix__. The expression:
  23
  24     push_back(ref(v), _1)
  25
  26 appends the parsed number. Like before, `_1` is a __phoenix__ placeholder for
  27 the parsed result attribute. Also, like before, `ref(v)` tells __phoenix__ that
  28 `v`, the `std::vector`, is a mutable reference.
  29
  30 [endsect]