forked from nlohmann/json
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathat_json_pointer.cpp
More file actions
103 lines (89 loc) · 2.38 KB
/
at_json_pointer.cpp
File metadata and controls
103 lines (89 loc) · 2.38 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create a JSON value
json j =
{
{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
};
// read-only access
// output element with JSON pointer "/number"
std::cout << j.at("/number"_json_pointer) << '\n';
// output element with JSON pointer "/string"
std::cout << j.at("/string"_json_pointer) << '\n';
// output element with JSON pointer "/array"
std::cout << j.at("/array"_json_pointer) << '\n';
// output element with JSON pointer "/array/1"
std::cout << j.at("/array/1"_json_pointer) << '\n';
// writing access
// change the string
j.at("/string"_json_pointer) = "bar";
// output the changed string
std::cout << j["string"] << '\n';
// change an array element
j.at("/array/1"_json_pointer) = 21;
// output the changed array
std::cout << j["array"] << '\n';
// out_of_range.106
try
{
// try to use an array index with leading '0'
json::reference ref = j.at("/array/01"_json_pointer);
}
catch (json::parse_error& e)
{
std::cout << e.what() << '\n';
}
// out_of_range.109
try
{
// try to use an array index that is not a number
json::reference ref = j.at("/array/one"_json_pointer);
}
catch (json::parse_error& e)
{
std::cout << e.what() << '\n';
}
// out_of_range.401
try
{
// try to use a an invalid array index
json::reference ref = j.at("/array/4"_json_pointer);
}
catch (json::out_of_range& e)
{
std::cout << e.what() << '\n';
}
// out_of_range.402
try
{
// try to use the array index '-'
json::reference ref = j.at("/array/-"_json_pointer);
}
catch (json::out_of_range& e)
{
std::cout << e.what() << '\n';
}
// out_of_range.403
try
{
// try to use a JSON pointer to an nonexistent object key
json::const_reference ref = j.at("/foo"_json_pointer);
}
catch (json::out_of_range& e)
{
std::cout << e.what() << '\n';
}
// out_of_range.404
try
{
// try to use a JSON pointer that cannot be resolved
json::reference ref = j.at("/number/foo"_json_pointer);
}
catch (json::out_of_range& e)
{
std::cout << e.what() << '\n';
}
}