Function wasmtime_environ::__core::char::decode_utf16

1.9.0 · source · [−]

pub fn decode_utf16<I>(iter: I) -> DecodeUtf16<<I as IntoIterator>::IntoIter>ⓘNotable traits for DecodeUtf16<I>impl<I> Iterator for DecodeUtf16<I> where
    I: Iterator<Item = u16>,     type Item = Result<char, DecodeUtf16Error>; where
    I: IntoIterator<Item = u16>,

Expand description

Creates an iterator over the UTF-16 encoded code points in iter, returning unpaired surrogates as Errs.

Examples

Basic usage:

use std::char::decode_utf16;

// 𝄞mus<invalid>ic<invalid>
let v = [
    0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0xDD1E, 0x0069, 0x0063, 0xD834,
];

assert_eq!(
    decode_utf16(v.iter().cloned())
        .map(|r| r.map_err(|e| e.unpaired_surrogate()))
        .collect::<Vec<_>>(),
    vec![
        Ok('𝄞'),
        Ok('m'), Ok('u'), Ok('s'),
        Err(0xDD1E),
        Ok('i'), Ok('c'),
        Err(0xD834)
    ]
);

A lossy decoder can be obtained by replacing Err results with the replacement character:

use std::char::{decode_utf16, REPLACEMENT_CHARACTER};

// 𝄞mus<invalid>ic<invalid>
let v = [
    0xD834, 0xDD1E, 0x006d, 0x0075, 0x0073, 0xDD1E, 0x0069, 0x0063, 0xD834,
];

assert_eq!(
    decode_utf16(v.iter().cloned())
       .map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))
       .collect::<String>(),
    "𝄞mus�ic�"
);