Make a ptr live longer than the closure for .map()

[cosmic vigil]

I'm working on something that interacts with LXC and currently I have problems with pointers (This is the first time I've really touched this stuff). Whenever I try turning an array of args (&[&str]) to a vector of pointers (Vec<*const i8>) it always drops them before I can actually use them. The reason is pretty obvious as .as_ptr() tells you, but I cant figure out a way to fix it.

[steady coral]

the thing that you need to not drop is the CStrings since they are what actually own the null-terminated strings

so, collect the CStrings and then, separately, iterate over that to collect the pointers to them

[cosmic vigil]

Wow, thanks

[fading fiber]

You could also call CString::into_raw

you'll have to remember to deallocate the CStrings after the function call though
(argv.into_iter().for_each(CString::from_raw);).
Not great compared to the other solution, if you don't mind the extra Vec for the CStrings.

[elder juniper]

first thing you're doing wrong is using vscode

💀