# encoding_rs::mem::is_utf16_bidi - Rust
API documentation for the Rust `is_utf16_bidi` fn in crate `encoding_rs`.
Keywords: rust, rustlang, rust-lang, is_utf16_bidi

# [−] [src] Function encoding_rs::mem::is_utf16_bidi

    pub fn is_utf16_bidi(buffer: &[u16]) -> bool

Checks whether a UTF-16 buffer contains code points that trigger right-to-left processing.

The check is done on a Unicode block basis without regard to assigned vs. unassigned code points in the block. Hebrew presentation forms in the Alphabetic Presentation Forms block are treated as if they formed a block on their own (i.e. it treated as right-to-left). Additionally, the four RIGHT-TO-LEFT FOO controls in General Punctuation are checked for. Control characters that are technically bidi controls but do not cause right-to-left behavior without the presence of right-to-left characters or right-to-left controls are not checked for. As a special case, U+FEFF is excluded from Arabic Presentation Forms-B.

Returns `true` if the input contains an RTL character or an unpaired high surrogate that could be the high half of an RTL character. Returns `false` if the input contains neither RTL characters nor unpaired high surrogates that could be higher halves of RTL characters.