Rust Getting started with Rust Console output without macros
Example
// use Write trait that contains write() function
use std::io::Write;
fn main() {
std::io::stdout().write(b"Hello, world!\n").unwrap();
}
-
The
std::io::Writetrait is designed for objects which accept byte streams. In this case, a handle to standard output is acquired withstd::io::stdout(). -
Write::write()accepts a byte slice (&[u8]), which is created with a byte-string literal (b"<string>").Write::write()returns aResult<usize, IoError>, which contains either the number of bytes written (on success) or an error value (on failure). -
The call to
Result::unwrap()indicates that the call is expected to succeed (Result<usize, IoError> -> usize), and the value is discarded.
