mirror of
https://github.com/nlohmann/json
synced 2024-11-25 13:20:05 +00:00
9aafcbe965
* Move UDLs into nlohmann::literals::json_literals namespace * Add 'using namespace' to unit tests * Add 'using namespace' to examples * Add 'using namespace' to README * Move UDL mkdocs pages out of basic_json/ * Update documentation * Update docset index * Add JSON_GlobalUDLs CMake option * Add unit test * Build examples without global UDLs * Add CI target
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#include <iostream>
|
|
#include <nlohmann/json.hpp>
|
|
|
|
using json = nlohmann::json;
|
|
using namespace nlohmann::literals;
|
|
|
|
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';
|
|
}
|