feat(users/Profpatsch/blog): add rust-string-conversions note
Change-Id: I7bee585935e65660f6b25b88ed33f09775eb01a0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/3088 Tested-by: BuildkiteCI Reviewed-by: Profpatsch <mail@profpatsch.de>
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2 changed files with 58 additions and 4 deletions
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@ -16,13 +16,16 @@ let
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bins.lowdown "-s" "-Thtml" "-o" "$out" note
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];
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preventing-oom = renderNote "preventing-oom" ./notes/preventing-oom.md;
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notes = [
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{
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route = [ "notes" "preventing-oom" ];
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name = "Preventing OOM";
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page = preventing-oom;
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page = renderNote "preventing-oom" ./notes/preventing-oom.md;
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}
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{
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route = [ "notes" "rust-string-conversions" ];
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name = "Converting between different String types in Rust";
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page = renderNote "rust-string-conversions" ./notes/rust-string-conversions.md;
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}
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];
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@ -308,7 +311,6 @@ let
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in depot.nix.utils.drvTargets {
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inherit
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preventing-oom
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router
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notes-server
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split-stdin
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52
users/Profpatsch/blog/notes/rust-string-conversions.md
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52
users/Profpatsch/blog/notes/rust-string-conversions.md
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@ -0,0 +1,52 @@
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# Converting between different String types in Rust
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```
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let s: String = ...
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let st: &str = ...
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let u: &[u8] = ...
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let b: [u8; 3] = b"foo"
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let v: Vec<u8> = ...
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let os: OsString = ...
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let ost: OsStr = ...
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From To Use Comment
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---- -- --- -------
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&str -> String String::from(st)
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&str -> &[u8] st.as_bytes()
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&str -> Vec<u8> st.as_bytes().to_owned() via &[u8]
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String -> &str &s alt. s.as_str()
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String -> &[u8] s.as_bytes()
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String -> Vec<u8> s.into_bytes()
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String -> OsString OsString::from(s)
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&[u8] -> &str str::from_utf8(u).unwrap()
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&[u8] -> String String::from_utf8(u).unwrap()
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&[u8] -> Vec<u8> u.to_owned()
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&[u8] -> &OsStr OsStr::from_bytes(u) use std::os::unix::ffi::OsStrExt;
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[u8; 3] -> &[u8] &b[..] byte literal
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[u8; 3] -> &[u8] "foo".as_bytes() alternative via utf8 literal
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Vec<u8> -> &str str::from_utf8(&v).unwrap() via &[u8]
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Vec<u8> -> String String::from_utf8(v)
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Vec<u8> -> &[u8] &v
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Vec<u8> -> OsString OsString::from_vec(v) use std::os::unix::ffi::OsStringExt;
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&OsStr -> &str ost.to_str().unwrap()
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&OsStr -> String ost.to_os_string().into_string() via OsString
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.unwrap()
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&OsStr -> Cow<str> ost.to_string_lossy() Unicode replacement characters
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&OsStr -> OsString ost.to_os_string()
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&OsStr -> &[u8] ost.as_bytes() use std::os::unix::ffi::OsStringExt;
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OsString -> String os.into_string().unwrap() returns original OsString on failure
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OsString -> &str os.to_str().unwrap()
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OsString -> &OsStr os.as_os_str()
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OsString -> Vec<u8> os.into_vec() use std::os::unix::ffi::OsStringExt;
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```
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## Source
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Original source is [this document on Pastebin](https://web.archive.org/web/20190710121935/https://pastebin.com/Mhfc6b9i)
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