Can .items() be used with std algorithms like transform

[av4625]

Hi I was saving keys in a vector like this:

std::vector<std::string> tracks;

const nlohmann::json config(nlohmann::json::parse(f));

for (const auto& track : config.items())
{
   tracks.emplace_back(track.key());
}

That was fine but then cppcheck was suggesting to use std::transform. I tried the following but get a segfault on the .key() call in the lambda:

std::vector<std::string> tracks;

const nlohmann::json config(nlohmann::json::parse(f));

std::transform(
    config.items().begin(),
    config.items().end(),
    tracks.begin(),
    [](const auto& track){return track.key();});

Is doing something like this possible?

I found an issue about using std algorithms here: #1045
It suggests a fix was done, but maybe not exactly the same issue.

[gregmarr]

Are you missing code in the sample? You need to either set the size of tracks to be the same as the number of entries in config or use the back_inserter wrapper to resize the vector as it goes.
https://godbolt.org/z/xnTMPdTKr

[av4625]

Ahhhh, I'm an idiot and back_inserter is what I need, thank you for pointing it out!