1 [/==============================================================================
2 Copyright (C) 2001-2015 Joel de Guzman
3 Copyright (C) 2001-2011 Hartmut Kaiser
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 ===============================================================================/]
9 [section Number List Redux - list syntax]
12 So far, we've been using the syntax:
14 double_ >> *(',' >> double_)
16 to parse a comma-delimited list of numbers. Such lists are common in parsing and
17 Spirit provides a simpler shortcut for them. The expression above can be
22 read as: a list of doubles separated by `','`.
24 This sample, again a variation of our previous example, demonstrates just that:
26 template <typename Iterator>
27 bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
30 using x3::phrase_parse;
34 auto push_back = [&](auto& ctx){ v.push_back(_attr(ctx)); };
36 bool r = phrase_parse(first, last,
40 double_[push_back] % ','
47 if (first != last) // fail if we did not get a full match
52 The full cpp file for this example can be found here: [@../../../example/x3/num_list/num_list3.cpp]