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diff --git a/users/Profpatsch/blog/notes/rust-string-conversions.md b/users/Profpatsch/blog/notes/rust-string-conversions.md new file mode 100644 index 0000000000..ac8c8f8925 --- /dev/null +++ b/users/Profpatsch/blog/notes/rust-string-conversions.md @@ -0,0 +1,52 @@ +# Converting between different String types in Rust + +``` +let s: String = ... +let st: &str = ... +let u: &[u8] = ... +let b: [u8; 3] = b"foo" +let v: Vec<u8> = ... +let os: OsString = ... +let ost: OsStr = ... + +From To Use Comment +---- -- --- ------- +&str -> String String::from(st) +&str -> &[u8] st.as_bytes() +&str -> Vec<u8> st.as_bytes().to_owned() via &[u8] + +String -> &str &s alt. s.as_str() +String -> &[u8] s.as_bytes() +String -> Vec<u8> s.into_bytes() +String -> OsString OsString::from(s) + +&[u8] -> &str str::from_utf8(u).unwrap() +&[u8] -> String String::from_utf8(u).unwrap() +&[u8] -> Vec<u8> u.to_owned() +&[u8] -> &OsStr OsStr::from_bytes(u) use std::os::unix::ffi::OsStrExt; + +[u8; 3] -> &[u8] &b[..] byte literal +[u8; 3] -> &[u8] "foo".as_bytes() alternative via utf8 literal + +Vec<u8> -> &str str::from_utf8(&v).unwrap() via &[u8] +Vec<u8> -> String String::from_utf8(v) +Vec<u8> -> &[u8] &v +Vec<u8> -> OsString OsString::from_vec(v) use std::os::unix::ffi::OsStringExt; + +&OsStr -> &str ost.to_str().unwrap() +&OsStr -> String ost.to_os_string().into_string() via OsString + .unwrap() +&OsStr -> Cow<str> ost.to_string_lossy() Unicode replacement characters +&OsStr -> OsString ost.to_os_string() +&OsStr -> &[u8] ost.as_bytes() use std::os::unix::ffi::OsStringExt; + +OsString -> String os.into_string().unwrap() returns original OsString on failure +OsString -> &str os.to_str().unwrap() +OsString -> &OsStr os.as_os_str() +OsString -> Vec<u8> os.into_vec() use std::os::unix::ffi::OsStringExt; +``` + + +## Source + +Original source is [this document on Pastebin](https://web.archive.org/web/20190710121935/https://pastebin.com/Mhfc6b9i) |