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0b39bc27
编写于
5月 19, 2013
作者:
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auto merge of #6624 : steveklabnik/rust/io_prelude, r=catamorphism
Let's actually give a top-level description of what's in here, eh?
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src/libcore/io.rs
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src/libcore/io.rs
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@@ -10,7 +10,37 @@
/*!
Basic input/output
The `io` module contains basic input and output routines.
A quick summary:
## `Reader` and `Writer` traits
These traits define the minimal set of methods that anything that can do
input and output should implement.
## `ReaderUtil` and `WriterUtil` traits
Richer methods that allow you to do more. `Reader` only lets you read a certain
number of bytes into a buffer, while `ReaderUtil` allows you to read a whole
line, for example.
Generally, these richer methods are probably the ones you want to actually
use in day-to-day Rust.
Furthermore, because there is an implementation of `ReaderUtil` for
`<T: Reader>`, when your input or output code implements `Reader`, you get
all of these methods for free.
## `print` and `println`
These very useful functions are defined here. You generally don't need to
import them, though, as the prelude already does.
## `stdin`, `stdout`, and `stderr`
These functions return references to the classic three file descriptors. They
implement `Reader` and `Writer`, where appropriate.
*/
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