mirror of
https://github.com/nlohmann/json.git
synced 2024-12-27 07:37:51 +08:00
0258484626
- updated documentation wrt. new repository layout - temporarily switched off Homebrew --HEAD building (can only be switched on after release) - set copyright date to 2018
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#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["/number"_json_pointer] << '\n';
|
|
// output element with JSON pointer "/string"
|
|
std::cout << j["/string"_json_pointer] << '\n';
|
|
// output element with JSON pointer "/array"
|
|
std::cout << j["/array"_json_pointer] << '\n';
|
|
// output element with JSON pointer "/array/1"
|
|
std::cout << j["/array/1"_json_pointer] << '\n';
|
|
|
|
// writing access
|
|
|
|
// change the string
|
|
j["/string"_json_pointer] = "bar";
|
|
// output the changed string
|
|
std::cout << j["string"] << '\n';
|
|
|
|
// "change" a nonexisting object entry
|
|
j["/boolean"_json_pointer] = true;
|
|
// output the changed object
|
|
std::cout << j << '\n';
|
|
|
|
// change an array element
|
|
j["/array/1"_json_pointer] = 21;
|
|
// "change" an array element with nonexisting index
|
|
j["/array/4"_json_pointer] = 44;
|
|
// output the changed array
|
|
std::cout << j["array"] << '\n';
|
|
|
|
// "change" the array element past the end
|
|
j["/array/-"_json_pointer] = 55;
|
|
// output the changed array
|
|
std::cout << j["array"] << '\n';
|
|
}
|