Only supports strings of length equal to or less than 32?

[marshallpierce]

Only supports strings of length equal to or less than 32?

[marshallpierce]

Just a quick note in passing; don't have time today to look into it -- since each array length is its own type, Rust only auto-implements the auto conversion to a slice for the first 32. There should be a method you can call to get a slice from it manually. Try the #rust-beginners IRC channel.

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On May 26, 2017, at 04:10, Brennan Kinney ***@***.***> wrote: A string greater than 32 characters/length seems to be unsupported? let a = b"abcdefghijklmnopqrstuvwxyzABCDEFG"; let b = encode(a); When compiling I get the error: error[E0277]: the trait bound `[u8; 33]: std::convert::AsRef<[u8]>` is not satisfied the trait `std::convert::AsRef<[u8]>` is not implemented for `[u8; 33]` help: the following implementations were found: <[T] as std::convert::AsRef<[T]>> <[T; 0] as std::convert::AsRef<[T]>> <[T; 1] as std::convert::AsRef<[T]>> <[T; 2] as std::convert::AsRef<[T]>> and 30 others = note: required by `base64::encode` The implementations would suggest that I guess. I'm new to Rust but I'd assume there would be a way to not have to continue new implementations for each additional length of the string to be supported? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[polarathene]

Thanks the response was:

b"..." strings are of type &[u8, N] and fixed size arrays only implement most traits up to length 32

So providing a type likw this works:

let a: &[u8] = b"abcdefghijklmnopqrstuvwxyzABCDEFG";

With another library I was using [u8] with my strings but that would fail as it expected a known size at compile time where inferring it was easier than knowing the number of elements..

Might be useful to include an example of a longer string with the typing like above? Or is it common knowledge and just something beginners to Rust trip up on?