Horizon
is_sax.hpp
1 #pragma once
2 
3 #include <cstdint> // size_t
4 #include <utility> // declval
5 #include <string> // string
6 
7 #include <nlohmann/detail/meta/detected.hpp>
8 #include <nlohmann/detail/meta/type_traits.hpp>
9 
10 namespace nlohmann
11 {
12 namespace detail
13 {
14 template <typename T>
15 using null_function_t = decltype(std::declval<T&>().null());
16 
17 template <typename T>
18 using boolean_function_t =
19  decltype(std::declval<T&>().boolean(std::declval<bool>()));
20 
21 template <typename T, typename Integer>
22 using number_integer_function_t =
23  decltype(std::declval<T&>().number_integer(std::declval<Integer>()));
24 
25 template <typename T, typename Unsigned>
26 using number_unsigned_function_t =
27  decltype(std::declval<T&>().number_unsigned(std::declval<Unsigned>()));
28 
29 template <typename T, typename Float, typename String>
30 using number_float_function_t = decltype(std::declval<T&>().number_float(
31  std::declval<Float>(), std::declval<const String&>()));
32 
33 template <typename T, typename String>
34 using string_function_t =
35  decltype(std::declval<T&>().string(std::declval<String&>()));
36 
37 template <typename T>
38 using start_object_function_t =
39  decltype(std::declval<T&>().start_object(std::declval<std::size_t>()));
40 
41 template <typename T, typename String>
42 using key_function_t =
43  decltype(std::declval<T&>().key(std::declval<String&>()));
44 
45 template <typename T>
46 using end_object_function_t = decltype(std::declval<T&>().end_object());
47 
48 template <typename T>
49 using start_array_function_t =
50  decltype(std::declval<T&>().start_array(std::declval<std::size_t>()));
51 
52 template <typename T>
53 using end_array_function_t = decltype(std::declval<T&>().end_array());
54 
55 template <typename T, typename Exception>
56 using parse_error_function_t = decltype(std::declval<T&>().parse_error(
57  std::declval<std::size_t>(), std::declval<const std::string&>(),
58  std::declval<const Exception&>()));
59 
60 template <typename SAX, typename BasicJsonType>
61 struct is_sax
62 {
63  private:
64  static_assert(is_basic_json<BasicJsonType>::value,
65  "BasicJsonType must be of type basic_json<...>");
66 
67  using number_integer_t = typename BasicJsonType::number_integer_t;
68  using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
69  using number_float_t = typename BasicJsonType::number_float_t;
70  using string_t = typename BasicJsonType::string_t;
71  using exception_t = typename BasicJsonType::exception;
72 
73  public:
74  static constexpr bool value =
75  is_detected_exact<bool, null_function_t, SAX>::value &&
76  is_detected_exact<bool, boolean_function_t, SAX>::value &&
77  is_detected_exact<bool, number_integer_function_t, SAX,
78  number_integer_t>::value &&
79  is_detected_exact<bool, number_unsigned_function_t, SAX,
80  number_unsigned_t>::value &&
81  is_detected_exact<bool, number_float_function_t, SAX, number_float_t,
82  string_t>::value &&
83  is_detected_exact<bool, string_function_t, SAX, string_t>::value &&
84  is_detected_exact<bool, start_object_function_t, SAX>::value &&
85  is_detected_exact<bool, key_function_t, SAX, string_t>::value &&
86  is_detected_exact<bool, end_object_function_t, SAX>::value &&
87  is_detected_exact<bool, start_array_function_t, SAX>::value &&
88  is_detected_exact<bool, end_array_function_t, SAX>::value &&
89  is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value;
90 };
91 
92 template <typename SAX, typename BasicJsonType>
93 struct is_sax_static_asserts
94 {
95  private:
96  static_assert(is_basic_json<BasicJsonType>::value,
97  "BasicJsonType must be of type basic_json<...>");
98 
99  using number_integer_t = typename BasicJsonType::number_integer_t;
100  using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
101  using number_float_t = typename BasicJsonType::number_float_t;
102  using string_t = typename BasicJsonType::string_t;
103  using exception_t = typename BasicJsonType::exception;
104 
105  public:
106  static_assert(is_detected_exact<bool, null_function_t, SAX>::value,
107  "Missing/invalid function: bool null()");
108  static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
109  "Missing/invalid function: bool boolean(bool)");
110  static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
111  "Missing/invalid function: bool boolean(bool)");
112  static_assert(
113  is_detected_exact<bool, number_integer_function_t, SAX,
114  number_integer_t>::value,
115  "Missing/invalid function: bool number_integer(number_integer_t)");
116  static_assert(
117  is_detected_exact<bool, number_unsigned_function_t, SAX,
118  number_unsigned_t>::value,
119  "Missing/invalid function: bool number_unsigned(number_unsigned_t)");
120  static_assert(is_detected_exact<bool, number_float_function_t, SAX,
121  number_float_t, string_t>::value,
122  "Missing/invalid function: bool number_float(number_float_t, const string_t&)");
123  static_assert(
124  is_detected_exact<bool, string_function_t, SAX, string_t>::value,
125  "Missing/invalid function: bool string(string_t&)");
126  static_assert(is_detected_exact<bool, start_object_function_t, SAX>::value,
127  "Missing/invalid function: bool start_object(std::size_t)");
128  static_assert(is_detected_exact<bool, key_function_t, SAX, string_t>::value,
129  "Missing/invalid function: bool key(string_t&)");
130  static_assert(is_detected_exact<bool, end_object_function_t, SAX>::value,
131  "Missing/invalid function: bool end_object()");
132  static_assert(is_detected_exact<bool, start_array_function_t, SAX>::value,
133  "Missing/invalid function: bool start_array(std::size_t)");
134  static_assert(is_detected_exact<bool, end_array_function_t, SAX>::value,
135  "Missing/invalid function: bool end_array()");
136  static_assert(
137  is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value,
138  "Missing/invalid function: bool parse_error(std::size_t, const "
139  "std::string&, const exception&)");
140 };
141 } // namespace detail
142 } // namespace nlohmann
nlohmann
namespace for Niels Lohmann
Definition: adl_serializer.hpp:9