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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
10namespace nlohmann
11{
12namespace detail
13{
14template<typename T>
15using null_function_t = decltype(std::declval<T&>().null());
16
17template<typename T>
18using boolean_function_t =
19 decltype(std::declval<T&>().boolean(std::declval<bool>()));
20
21template<typename T, typename Integer>
22using number_integer_function_t =
23 decltype(std::declval<T&>().number_integer(std::declval<Integer>()));
24
25template<typename T, typename Unsigned>
26using number_unsigned_function_t =
27 decltype(std::declval<T&>().number_unsigned(std::declval<Unsigned>()));
28
29template<typename T, typename Float, typename String>
30using number_float_function_t = decltype(std::declval<T&>().number_float(
31 std::declval<Float>(), std::declval<const String&>()));
32
33template<typename T, typename String>
34using string_function_t =
35 decltype(std::declval<T&>().string(std::declval<String&>()));
36
37template<typename T, typename Binary>
38using binary_function_t =
39 decltype(std::declval<T&>().binary(std::declval<Binary&>()));
40
41template<typename T>
42using start_object_function_t =
43 decltype(std::declval<T&>().start_object(std::declval<std::size_t>()));
44
45template<typename T, typename String>
46using key_function_t =
47 decltype(std::declval<T&>().key(std::declval<String&>()));
48
49template<typename T>
50using end_object_function_t = decltype(std::declval<T&>().end_object());
51
52template<typename T>
53using start_array_function_t =
54 decltype(std::declval<T&>().start_array(std::declval<std::size_t>()));
55
56template<typename T>
57using end_array_function_t = decltype(std::declval<T&>().end_array());
58
59template<typename T, typename Exception>
60using parse_error_function_t = decltype(std::declval<T&>().parse_error(
61 std::declval<std::size_t>(), std::declval<const std::string&>(),
62 std::declval<const Exception&>()));
63
64template<typename SAX, typename BasicJsonType>
65struct is_sax
66{
67 private:
69 "BasicJsonType must be of type basic_json<...>");
70
71 using number_integer_t = typename BasicJsonType::number_integer_t;
72 using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
73 using number_float_t = typename BasicJsonType::number_float_t;
74 using string_t = typename BasicJsonType::string_t;
75 using binary_t = typename BasicJsonType::binary_t;
76 using exception_t = typename BasicJsonType::exception;
77
78 public:
79 static constexpr bool value =
80 is_detected_exact<bool, null_function_t, SAX>::value &&
81 is_detected_exact<bool, boolean_function_t, SAX>::value &&
82 is_detected_exact<bool, number_integer_function_t, SAX, number_integer_t>::value &&
83 is_detected_exact<bool, number_unsigned_function_t, SAX, number_unsigned_t>::value &&
84 is_detected_exact<bool, number_float_function_t, SAX, number_float_t, string_t>::value &&
85 is_detected_exact<bool, string_function_t, SAX, string_t>::value &&
86 is_detected_exact<bool, binary_function_t, SAX, binary_t>::value &&
87 is_detected_exact<bool, start_object_function_t, SAX>::value &&
88 is_detected_exact<bool, key_function_t, SAX, string_t>::value &&
89 is_detected_exact<bool, end_object_function_t, SAX>::value &&
90 is_detected_exact<bool, start_array_function_t, SAX>::value &&
91 is_detected_exact<bool, end_array_function_t, SAX>::value &&
92 is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value;
93};
94
95template<typename SAX, typename BasicJsonType>
97{
98 private:
100 "BasicJsonType must be of type basic_json<...>");
101
102 using number_integer_t = typename BasicJsonType::number_integer_t;
103 using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
104 using number_float_t = typename BasicJsonType::number_float_t;
105 using string_t = typename BasicJsonType::string_t;
106 using binary_t = typename BasicJsonType::binary_t;
107 using exception_t = typename BasicJsonType::exception;
108
109 public:
110 static_assert(is_detected_exact<bool, null_function_t, SAX>::value,
111 "Missing/invalid function: bool null()");
112 static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
113 "Missing/invalid function: bool boolean(bool)");
114 static_assert(is_detected_exact<bool, boolean_function_t, SAX>::value,
115 "Missing/invalid function: bool boolean(bool)");
116 static_assert(
117 is_detected_exact<bool, number_integer_function_t, SAX,
118 number_integer_t>::value,
119 "Missing/invalid function: bool number_integer(number_integer_t)");
120 static_assert(
121 is_detected_exact<bool, number_unsigned_function_t, SAX,
122 number_unsigned_t>::value,
123 "Missing/invalid function: bool number_unsigned(number_unsigned_t)");
124 static_assert(is_detected_exact<bool, number_float_function_t, SAX,
125 number_float_t, string_t>::value,
126 "Missing/invalid function: bool number_float(number_float_t, const string_t&)");
127 static_assert(
128 is_detected_exact<bool, string_function_t, SAX, string_t>::value,
129 "Missing/invalid function: bool string(string_t&)");
130 static_assert(
131 is_detected_exact<bool, binary_function_t, SAX, binary_t>::value,
132 "Missing/invalid function: bool binary(binary_t&)");
133 static_assert(is_detected_exact<bool, start_object_function_t, SAX>::value,
134 "Missing/invalid function: bool start_object(std::size_t)");
135 static_assert(is_detected_exact<bool, key_function_t, SAX, string_t>::value,
136 "Missing/invalid function: bool key(string_t&)");
137 static_assert(is_detected_exact<bool, end_object_function_t, SAX>::value,
138 "Missing/invalid function: bool end_object()");
139 static_assert(is_detected_exact<bool, start_array_function_t, SAX>::value,
140 "Missing/invalid function: bool start_array(std::size_t)");
141 static_assert(is_detected_exact<bool, end_array_function_t, SAX>::value,
142 "Missing/invalid function: bool end_array()");
143 static_assert(
144 is_detected_exact<bool, parse_error_function_t, SAX, exception_t>::value,
145 "Missing/invalid function: bool parse_error(std::size_t, const "
146 "std::string&, const exception&)");
147};
148} // namespace detail
149} // namespace nlohmann
@ value
the parser finished reading a JSON value
namespace for Niels Lohmann
Definition adl_serializer.hpp:12
Definition type_traits.hpp:42
Definition is_sax.hpp:66