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c7d5f7e5
编写于
8月 23, 2016
作者:
S
Steven Allen
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Rust has type aliases, not typedefs.
They're the same thing but it's better to keep the terminology consistent.
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src/libcollections/fmt.rs
src/libcollections/fmt.rs
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src/libcollections/fmt.rs
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@@ -165,15 +165,15 @@
//! provides some helper methods.
//!
//! Additionally, the return value of this function is `fmt::Result` which is a
//! type
def to `Result<(), std::fmt::Error>`. Formatting implementations should
//!
ensure that they propagate errors from the `Formatter` (e.g., when calling
//!
`write!`) however, they should never return errors spuriously. That is, a
//!
formatting implementation must and may only return an error if the passed-in
//!
`Formatter` returns an error. This is because, contrary to what the function
//!
signature might suggest, string formatting is an infallible operation.
//!
This function only returns a result because writing to the underlying stream
//!
might fail and it must provide a way to propagate the fact that an error has
//! occurred back up the stack.
//! type
alias of `Result<(), std::fmt::Error>`. Formatting implementations
//!
should ensure that they propagate errors from the `Formatter` (e.g., when
//!
calling `write!`) however, they should never return errors spuriously. That
//!
is, a formatting implementation must and may only return an error if the
//!
passed-in `Formatter` returns an error. This is because, contrary to what
//!
the function signature might suggest, string formatting is an infallible
//!
operation. This function only returns a result because writing to the
//!
underlying stream might fail and it must provide a way to propagate the fact
//!
that an error has
occurred back up the stack.
//!
//! An example of implementing the formatting traits would look
//! like:
...
...
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