Can't use ifstream and .clear()

[VignRaph]

My code stops with error:
Exception non gérée à 0x00007FFE1BC6A388 dans Debug.exe : exception Microsoft C++ : nlohmann::detail::parse_error à l'emplacement de mémoire 0x00000089E48FCB38.

My code can be represenseted as following :

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

int main()
{
    std::ifstream file1("1.json"),
        file2("2.json");
    nlohmann::json JsonObject;

    std::cout << JsonObject;         //outputs :   null

    file1 >> JsonObject;               //works fine
    
    //some code

    JsonObject.clear();
    std::cout << JsonObject;       //outputs :   {}

    file2 >> JsonObject;                //error mentionned higher
}

I think it as to do with the fact that .clear() leaves the json object as {} instead of null

I have VisualStudio Community 2017 on Windows 10 and nlohmann json version 3.3.0

[gregmarr]

The clear() function resets the value but keeps the current type. If you're reading new, you should reset it as if it were default constructed:

JsonObject = nlohmann::json{};

Do you get the same error if you reverse the order of reading the files? Have you validated that 2.json is a valid JSON file?

[nlohmann]

@gregmarr is right. Here is the documentation of clear.

And if you encounter a parse_error, it's description should contain an indication about the reasons parsing valued, e.g. "unexpected end of file".

[VignRaph]

Thanks for your response, it worked just fine using :

JsonObject = nlohmann::json{};

and it actually returned parse_error à l'emplacement de mémoire 0x0000000C27AFC9D8 at the same time as the error