Lib.rs

一个Rust过程宏，用于创建UTF-16编码的常量（如&[u16; N]）

#[macro_use]
extern crate utf16_literal;

extern "system" {
    fn MessageBoxW(*const (), *const u16, *const u16)
}

fn main() {
    let title = u16!("Rust Code\0");
    let msg = u16!("Hello World\0");
    unsafe {
        MessageBoxW(::std::ptr::null(), msg, title, 0);
    }
}

lib.rs:

该包提供了utf16!宏，该宏接受一个字符串字面量并生成一个包含该字符串UTF-16编码版本的&[u16; N]。

#![feature(proc_macro_hygiene)]	// Needed to use the macro in an expression
extern crate utf16_literal;

let v = utf16_literal::utf16!("Foo\u{1234}😀");
assert_eq!(v[0], 'F' as u16);
assert_eq!(v[1], 'o' as u16);
assert_eq!(v[2], 'o' as u16);
assert_eq!(v[3], 0x1234);
assert_eq!(v[4], 0xD83D);
assert_eq!(v[5], 0xDE00);
assert_eq!(v.len(), 6);