| 9 | using namespace boost::parser; |
| 10 | |
| 11 | void compile_or_attribute() |
| 12 | { |
| 13 | char const chars[] = ""; |
| 14 | auto first = std::begin(chars); |
| 15 | auto const last = std::end(chars); |
| 16 | |
| 17 | // scalar and eps |
| 18 | { |
| 19 | constexpr auto parser = int_ | eps; |
| 20 | using attr_t = decltype(prefix_parse(first, last, parser)); |
| 21 | static_assert( |
| 22 | std::is_same_v<attr_t, std::optional<std::optional<int>>>); |
| 23 | static_assert(std::is_same_v< |
| 24 | attribute_t< |
| 25 | decltype(BOOST_PARSER_SUBRANGE(first, last)), |
| 26 | decltype(parser)>, |
| 27 | std::optional<int>>); |
| 28 | } |
| 29 | |
| 30 | // scalar | scalar |
| 31 | { |
| 32 | constexpr auto parser = char_ | char_; |
| 33 | using attr_t = decltype(prefix_parse(first, last, parser)); |
| 34 | static_assert(std::is_same_v<attr_t, std::optional<char>>); |
| 35 | static_assert(std::is_same_v< |
| 36 | attribute_t< |
| 37 | decltype(BOOST_PARSER_SUBRANGE(first, last)), |
| 38 | decltype(parser)>, |
| 39 | char>); |
| 40 | } |
| 41 | { |
| 42 | constexpr auto parser = char_ | char_ | eps; |
| 43 | using attr_t = decltype(prefix_parse(first, last, parser)); |
| 44 | static_assert( |
| 45 | std::is_same_v<attr_t, std::optional<std::optional<char>>>); |
| 46 | static_assert(std::is_same_v< |
| 47 | attribute_t< |
| 48 | decltype(BOOST_PARSER_SUBRANGE(first, last)), |
| 49 | decltype(parser)>, |
| 50 | std::optional<char>>); |
| 51 | } |
| 52 | { |
| 53 | constexpr auto parser = int_ | char_; |
| 54 | using attr_t = decltype(prefix_parse(first, last, parser)); |
| 55 | static_assert( |
| 56 | std::is_same_v<attr_t, std::optional<std::variant<int, char>>>); |
| 57 | static_assert(std::is_same_v< |
| 58 | attribute_t< |
| 59 | decltype(BOOST_PARSER_SUBRANGE(first, last)), |
| 60 | decltype(parser)>, |
| 61 | std::variant<int, char>>); |
| 62 | } |
| 63 | { |
| 64 | constexpr auto parser = int_ | char_ | eps; |
| 65 | using attr_t = decltype(prefix_parse(first, last, parser)); |
| 66 | static_assert(std::is_same_v< |
| 67 | attr_t, |
| 68 | std::optional<std::optional<std::variant<int, char>>>>); |