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7c673cae FG |
1 | [#spaces] |
2 | [section spaces] | |
3 | ||
4 | [h1 Synopsis] | |
5 | ||
6 | struct spaces; | |
7 | ||
8 | This is a [link parser parser]. | |
9 | ||
10 | [h1 Description] | |
11 | ||
12 | `spaces` accepts any number of whitespace characters. It requires at least one | |
13 | to be present. | |
14 | ||
15 | [h1 Header] | |
16 | ||
17 | #include <boost/metaparse/spaces.hpp> | |
18 | ||
19 | [h1 Expression semantics] | |
20 | ||
21 | spaces | |
22 | ||
23 | is equivalent to | |
24 | ||
25 | repeated1<space> | |
26 | ||
27 | [h1 Example] | |
28 | ||
29 | #include <boost/metaparse/spaces.hpp> | |
30 | #include <boost/metaparse/start.hpp> | |
31 | #include <boost/metaparse/string.hpp> | |
32 | #include <boost/metaparse/is_error.hpp> | |
33 | #include <boost/metaparse/get_remaining.hpp> | |
34 | ||
35 | #include <type_traits> | |
36 | ||
37 | using namespace boost::metaparse; | |
38 | ||
39 | static_assert( | |
40 | std::is_same< | |
41 | BOOST_METAPARSE_STRING("foo"), | |
42 | get_remaining<spaces::apply<BOOST_METAPARSE_STRING(" foo"), start>>::type | |
43 | >::type::value, | |
44 | "it should consume all whitespaces at the beginning of the input" | |
45 | ); | |
46 | ||
47 | static_assert( | |
48 | is_error<spaces::apply<BOOST_METAPARSE_STRING("x"), start>>::type::value, | |
49 | "it should return an error when the input does not begin with a whitespace" | |
50 | ); | |
51 | ||
52 | [endsect] | |
53 |