Struct io_providers::stream::Virtual
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[src]
pub struct Virtual { /* fields omitted */ }Provides virtual input/output/error streams: input can be provided using
Virtual::write_input(), and output can be observed using Virtual::read_output() and
Virtual::read_error().
Methods
impl Virtual[src]
fn new() -> Virtual
Creates a new, empty virtual stream provider.
fn write_input(&mut self, input: &[u8])
Writes the provided buffer to the queue of buffers to be used when input is requested
from this provider using Provider::input().
In particular, this method does NOT append data to a continuous buffer which is consumed
by Provider::input(); rather, it enqueues a buffer which will be used for a SINGLE call
to Provider::input(). The buffer is then discarded, regardless of how much of it was
(or was not) read.
This enables precise control over the length of data returned from a call to
Provider::input().
Example
use io_providers::stream; let mut streams = stream::Virtual::new(); streams.write_input("foo".as_bytes()); streams.write_input("bar".as_bytes()); // The first read on `streams.input()` will read from "foo" // The second read on `streams.input()` will read from "bar"
fn read_output<'a>(&'a self) -> &'a [u8]
Gets the data which has been written to the output stream.
Example
use std::io::Write; use io_providers::stream; use io_providers::stream::Provider; let mut streams = stream::Virtual::new(); writeln!(streams.output(), "test1"); write!(streams.output(), "test2"); assert_eq!("test1\ntest2", ::std::str::from_utf8(streams.read_output()).unwrap());
fn read_error<'a>(&'a self) -> &'a [u8]
Gets the data which has been written to error stream.
Example
use std::io::Write; use io_providers::stream; use io_providers::stream::Provider; let mut streams = stream::Virtual::new(); writeln!(streams.error(), "test1"); write!(streams.error(), "test2"); assert_eq!("test1\ntest2", ::std::str::from_utf8(streams.read_error()).unwrap());