| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_DETAIL_OPTIONAL_STRING_HPP | ||
| 11 | #define BOOST_URL_DETAIL_OPTIONAL_STRING_HPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/string_view.hpp> | ||
| 14 | #include <boost/core/detail/string_view.hpp> | ||
| 15 | |||
| 16 | namespace boost { | ||
| 17 | namespace urls { | ||
| 18 | |||
| 19 | #ifndef BOOST_URL_DOCS | ||
| 20 | struct no_value_t; | ||
| 21 | #endif | ||
| 22 | |||
| 23 | namespace detail { | ||
| 24 | struct optional_string | ||
| 25 | { | ||
| 26 | core::string_view s; | ||
| 27 | bool b = false; | ||
| 28 | }; | ||
| 29 | |||
| 30 | template <class String> | ||
| 31 | typename std::enable_if< | ||
| 32 | std::is_convertible<String, core::string_view>::value, | ||
| 33 | optional_string>::type | ||
| 34 | 809 | get_optional_string( | |
| 35 | String const& s) | ||
| 36 | { | ||
| 37 | 809 | optional_string r; | |
| 38 | 809 | r.s = s; | |
| 39 | 809 | r.b = true; | |
| 40 | 809 | return r; | |
| 41 | } | ||
| 42 | |||
| 43 | template <class T, class = void> | ||
| 44 | struct is_dereferenceable : std::false_type | ||
| 45 | {}; | ||
| 46 | |||
| 47 | template <class T> | ||
| 48 | struct is_dereferenceable< | ||
| 49 | T, | ||
| 50 | void_t< | ||
| 51 | decltype(*std::declval<T>()) | ||
| 52 | >> : std::true_type | ||
| 53 | {}; | ||
| 54 | |||
| 55 | template <class OptionalString> | ||
| 56 | typename std::enable_if< | ||
| 57 | !std::is_convertible<OptionalString, core::string_view>::value, | ||
| 58 | optional_string>::type | ||
| 59 | 6 | get_optional_string( | |
| 60 | OptionalString const& opt) | ||
| 61 | { | ||
| 62 | // If this goes off, it means the rule | ||
| 63 | // passed in did not meet the requirements. | ||
| 64 | // Please check the documentation of functions | ||
| 65 | // that call get_optional_string. | ||
| 66 | static_assert( | ||
| 67 | is_dereferenceable<OptionalString>::value && | ||
| 68 | std::is_constructible<bool, OptionalString>::value && | ||
| 69 | !std::is_convertible<OptionalString, core::string_view>::value && | ||
| 70 | std::is_convertible<typename std::decay<decltype(*std::declval<OptionalString>())>::type, core::string_view>::value, | ||
| 71 | "OptionalString requirements not met"); | ||
| 72 | 6 | optional_string r; | |
| 73 |
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6 | r.s = opt ? detail::to_sv(*opt) : core::string_view{}; |
| 74 | 6 | r.b = static_cast<bool>(opt); | |
| 75 | 6 | return r; | |
| 76 | } | ||
| 77 | |||
| 78 | inline | ||
| 79 | optional_string | ||
| 80 | 21 | get_optional_string( | |
| 81 | std::nullptr_t) | ||
| 82 | { | ||
| 83 | 21 | return {}; | |
| 84 | } | ||
| 85 | |||
| 86 | inline | ||
| 87 | optional_string | ||
| 88 | 388 | get_optional_string( | |
| 89 | no_value_t const&) | ||
| 90 | { | ||
| 91 | 388 | return {}; | |
| 92 | } | ||
| 93 | |||
| 94 | |||
| 95 | } // detail | ||
| 96 | } // urls | ||
| 97 | } // boost | ||
| 98 | |||
| 99 | #endif | ||
| 100 |