Parse error on valid json file

[nittdeniz]

I validated my JSON file with various tools online and they confirm that my JSON file has valid syntax. Yet I get a parse error

[
  {
    "particles": [
      ["antilepton", "lepton"],
      ["antilepton", "lepton"],
      ["photon"]
    ],
    "indices": [
      [],
      [],
      ["mu"]
    ],
    "rule": "-i*e*GA[mu]"
  }
]

what(): [json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal

To read the file I copied the example code from the README

std::ifstream ifs("my_file.json");
/*
std::stringstream ss;
ss << ifs.rdbuf();
std::cout << ss.str() << "\n";
// prints the file, so path is correct
*/

JSON json;
ifs >> json;
std::cout << json << "\n";

I also tried adding zeros in the empty arrays, but that didn't help either.

[nlohmann]

I wish I could say more than that the parse error indicates that it was not possible to retrieve any byte from the input. Can you try reading the input into a string and parse from there?

[nittdeniz]

Thanks, the following seems to be a workaround:

    std::ifstream ifs("my_file.json");
    std::stringstream ss;
    ss << ifs.rdbuf();
    std::string json_string = ss.str();

    JSON json = JSON::parse(json_string);