Issue with convert value string into std::string and vice versa

[tuongbuimtt]

Sometimes my output JSON has an invalid utf-8 string.
It seems to appear in a random position. My JSON has many nested fields, and adding one by one.
I mainly write values from std::string.
Do you have any advice for my case?

"sid":"1420\u0000\u0000\u0000\u00003649932"
the correct string is 14203649932

Thanks.

[tuongbuimtt]

Update:
I found myself that when I use functions like

string sid = "123456";
json.emplace("sid", sid);

will lead to my problem.

So I fixed that:

string sid = "123456";
json.emplace("sid", value(sid, copy_string));

And it works.
So I would like to suggest a new interface emplace that supports adding std::string directly for coding convenience.

[yosh-matsuda]

The emplace member function has the copy_string specifier in the 3rd argument.
Does this also solve your problem?

json.emplace("sid", sid, copy_string);

[tuongbuimtt]

I have tried

json.emplace("sid", sid, copy_string);

It works fine. 👍 thank for your support

[tuongbuimtt]

I have a question-answer When I tried:

std::string key = "the key";
json.emplace(key, 123);

Cause the segment faults error.
Is there a way to add a key from std::string? Because sometimes, the key can be modified many times, and I cannot always assign a const char* type for the key.

Update:

std::string key = "the key";
json.emplace(key, 123, copy_string);

get helpful. 👍