Struct Concat

pub struct Concat<I>
where
    I: Iterator,
    <I as Iterator>::Item: Read,
{ /* private fields */ }

Implementations

impl<I> Concat<I>

where I: Iterator, <I as Iterator>::Item: Read,

pub fn current(&self) -> Option<&<I as Iterator>::Item>

Returns a reference to the item last read, or None if the iterator has been exhausted.

This is useful for error handling and reporting: if a read operation fails, the reference returned will point to the item which caused the the error.

Examples found in repository

examples/cat.rs (line 19)

fn main() {
    let mut args = args_os();
    let progname = args.next().unwrap_or_else(|| OsString::from("cat"));

    let mut c = concat(args.map(InputSource::from));
    let res = copy(&mut c, &mut stdout());

    if let Err(e) = res {
        match c.current() {
            None => {
                println!("{}: {}\n",
                         AsRef::<Path>::as_ref(&progname).display(),
                         e);
            },

            Some(ref f) => {
                println!("{}: {}: {}\n",
                         AsRef::<Path>::as_ref(&progname).display(),
                         f.path().display(),
                         e);
            },
        };

        exit(1);
    }
}

Trait Implementations

impl<I> From<I> for Concat<I>

where I: Iterator, <I as Iterator>::Item: Read,

fn from(iter: I) -> Concat<I>

Converts to this type from the input type.

impl<I> Read for Concat<I>

where I: Iterator, <I as Iterator>::Item: Read,

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Reads all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Reads the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

Creates an adapter which will read at most limit bytes from it.