core::str::from_utf8_unchecked - Rust
Description: API documentation for the Rust `from_utf8_unchecked` fn in crate `core`.
Keywords: rust, rustlang, rust-lang, from_utf8_unchecked

# Function core::str::from_utf8_unchecked 1.0.0 [−] [src]

    pub unsafe fn from_utf8_unchecked(v: &[u8]) -> &str

Converts a slice of bytes to a string slice without checking that the string contains valid UTF-8.

See the safe version, `from_utf8()`, for more information.

# Safety

This function is unsafe because it does not check that the bytes passed to it are valid UTF-8. If this constraint is violated, undefined behavior results, as the rest of Rust assumes that `&str`s are valid UTF-8.

# Examples

Basic usage:

    use std::str;

    // some bytes, in a vector
    let sparkle_heart = vec![240, 159, 146, 150];

    let sparkle_heart = unsafe {
        str::from_utf8_unchecked(&sparkle_heart)
    };

    assert_eq!("💖", sparkle_heart);Run

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