Input ordered_json doesn't work

[supsm]

What is the issue you have?

When inputting/parsing an ordered_json, it does not keep the order found in the file. This is due to the fact that the parser functions use basic_json instead of ordered_json

Please describe the steps to reproduce the issue.

Create an ordered_json
Input a json with its keys not in alphabetical order
Output the ordered_json
The order will not be preserved

1. Create an ordered_json
2. Input a json with its keys not in alphabetical order
3. Output the ordered_json
4. The order will not be preserved

Can you provide a small but working code example?

#include <fstream>
#include "nlohmann/json.hpp"

int main()
{
    nlohmann::ordered_json j;
    std::ifstream fin("json.json");
    fin >> j;
    fin.close();
    std::ofstream fout("json.json");
    fout << j << std::endl;
    fout.close()
}

json.json:

{
    "b": "b",
    "c": "c",
    "a": "a",
}

What is the expected behavior?

When the json is outputted, it should be exactly the same

And what is the actual behavior instead?

The order is changed to "a", "b", "c"

Which compiler and operating system are you using?

• Compiler: MSVC 19.29.30037 (also tried with clang++ 12.0.0)
• Operating system: Windows 11 22458.1000

Which version of the library did you use?

• latest release version 3.10.2
• other release - please state the version: 3.9.1
• the develop branch

If you experience a compilation error: can you compile and run the unit tests?

• yes
• no - please copy/paste the error message below

[supsm]

Sorry I'm an idiot

[sentiment-bot]

Please be sure to review the code of conduct and be respectful of other users. cc/ @nlohmann

[nlohmann]

For reference: if you want to parse to ordered_json, then you need to call ordered_json::parse.