. /include/boost/url /detail /optional_string.hpp
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1   // 1   //
2   // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com) 2   // Copyright (c) 2022 Alan de Freitas (alandefreitas@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 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) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/boostorg/url 7   // Official repository: https://github.com/boostorg/url
8   // 8   //
9   9  
10   #ifndef BOOST_URL_DETAIL_OPTIONAL_STRING_HPP 10   #ifndef BOOST_URL_DETAIL_OPTIONAL_STRING_HPP
11   #define BOOST_URL_DETAIL_OPTIONAL_STRING_HPP 11   #define BOOST_URL_DETAIL_OPTIONAL_STRING_HPP
12   12  
13   #include <boost/url/detail/string_view.hpp> 13   #include <boost/url/detail/string_view.hpp>
14   #include <boost/core/detail/string_view.hpp> 14   #include <boost/core/detail/string_view.hpp>
15   15  
16   namespace boost { 16   namespace boost {
17   namespace urls { 17   namespace urls {
18   18  
19   #ifndef BOOST_URL_DOCS 19   #ifndef BOOST_URL_DOCS
20   struct no_value_t; 20   struct no_value_t;
21   #endif 21   #endif
22   22  
23   namespace detail { 23   namespace detail {
24   struct optional_string 24   struct optional_string
25   { 25   {
26   core::string_view s; 26   core::string_view s;
27   bool b = false; 27   bool b = false;
28   }; 28   };
29   29  
30   template <class String> 30   template <class String>
31   typename std::enable_if< 31   typename std::enable_if<
32   std::is_convertible<String, core::string_view>::value, 32   std::is_convertible<String, core::string_view>::value,
33   optional_string>::type 33   optional_string>::type
HITCBC 34   1597 get_optional_string( 34   1601 get_optional_string(
35   String const& s) 35   String const& s)
36   { 36   {
HITCBC 37   1597 optional_string r; 37   1601 optional_string r;
HITCBC 38   1597 r.s = s; 38   1601 r.s = s;
HITCBC 39   1597 r.b = true; 39   1601 r.b = true;
HITCBC 40   1597 return r; 40   1601 return r;
41   } 41   }
42   42  
43   template <class T, class = void> 43   template <class T, class = void>
44   struct is_dereferenceable : std::false_type 44   struct is_dereferenceable : std::false_type
45   {}; 45   {};
46   46  
47   template <class T> 47   template <class T>
48   struct is_dereferenceable< 48   struct is_dereferenceable<
49   T, 49   T,
50   void_t< 50   void_t<
51   decltype(*std::declval<T>()) 51   decltype(*std::declval<T>())
52   >> : std::true_type 52   >> : std::true_type
53   {}; 53   {};
54   54  
55   template <class OptionalString> 55   template <class OptionalString>
56   typename std::enable_if< 56   typename std::enable_if<
57   !std::is_convertible<OptionalString, core::string_view>::value, 57   !std::is_convertible<OptionalString, core::string_view>::value,
58   optional_string>::type 58   optional_string>::type
HITCBC 59   6 get_optional_string( 59   6 get_optional_string(
60   OptionalString const& opt) 60   OptionalString const& opt)
61   { 61   {
62   // If this goes off, it means the rule 62   // If this goes off, it means the rule
63   // passed in did not meet the requirements. 63   // passed in did not meet the requirements.
64   // Please check the documentation of functions 64   // Please check the documentation of functions
65   // that call get_optional_string. 65   // that call get_optional_string.
66   static_assert( 66   static_assert(
67   is_dereferenceable<OptionalString>::value && 67   is_dereferenceable<OptionalString>::value &&
68   std::is_constructible<bool, OptionalString>::value && 68   std::is_constructible<bool, OptionalString>::value &&
69   !std::is_convertible<OptionalString, core::string_view>::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, 70   std::is_convertible<typename std::decay<decltype(*std::declval<OptionalString>())>::type, core::string_view>::value,
71   "OptionalString requirements not met"); 71   "OptionalString requirements not met");
HITCBC 72   6 optional_string r; 72   6 optional_string r;
HITCBC 73   6 r.s = opt ? detail::to_sv(*opt) : core::string_view{}; 73   6 r.s = opt ? detail::to_sv(*opt) : core::string_view{};
HITCBC 74   6 r.b = static_cast<bool>(opt); 74   6 r.b = static_cast<bool>(opt);
HITCBC 75   6 return r; 75   6 return r;
76   } 76   }
77   77  
78   inline 78   inline
79   optional_string 79   optional_string
HITCBC 80   21 get_optional_string( 80   21 get_optional_string(
81   std::nullptr_t) 81   std::nullptr_t)
82   { 82   {
HITCBC 83   21 return {}; 83   21 return {};
84   } 84   }
85   85  
86   inline 86   inline
87   optional_string 87   optional_string
HITCBC 88   929 get_optional_string( 88   929 get_optional_string(
89   no_value_t const&) 89   no_value_t const&)
90   { 90   {
HITCBC 91   929 return {}; 91   929 return {};
92   } 92   }
93   93  
94   94  
95   } // detail 95   } // detail
96   } // urls 96   } // urls
97   } // boost 97   } // boost
98   98  
99   #endif 99   #endif