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zh-CN: translation for "17.4 Casting" (#2294)

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@ -6987,8 +6987,8 @@ msgid ""
"Rust has no _implicit_ type conversions, but does support explicit casts " "Rust has no _implicit_ type conversions, but does support explicit casts "
"with `as`. These generally follow C semantics where those are defined." "with `as`. These generally follow C semantics where those are defined."
msgstr "" msgstr ""
"Rust 不支持 _implicit_ 类型转换，但支持使用 `as` 进行显式转换。这些转换通常遵" "Rust 没有隐式类型转换，但支持使用 `as` 进行显式转换。转换写法通常和 C 语言的"
"循定义它们的 C 语义。" "写法相一致。"
#: src/std-traits/casting.md #: src/std-traits/casting.md
msgid "\"as u16: {}\"" msgid "\"as u16: {}\""
@ -7003,14 +7003,13 @@ msgid "\"as u8: {}\""
msgstr "\"as u8: {}\"" msgstr "\"as u8: {}\""
#: src/std-traits/casting.md #: src/std-traits/casting.md
#, fuzzy
msgid "" msgid ""
"The results of `as` are _always_ defined in Rust and consistent across " "The results of `as` are _always_ defined in Rust and consistent across "
"platforms. This might not match your intuition for changing sign or casting " "platforms. This might not match your intuition for changing sign or casting "
"to a smaller type -- check the docs, and comment for clarity." "to a smaller type -- check the docs, and comment for clarity."
msgstr "" msgstr ""
"使用 `as` 的结果在 Rust 中 _始终_ 定义明确，并且在不同平台上保持一致。这可能" "使用 `as` 的结果在 Rust 中 _始终_ 定义明确，并且在不同平台上保持一致。这可能"
"不符合您对于更改符号或转换为更小类型的直观理解。为清晰起见，请查看文档和注" "和您对于更改符号或转换为更小类型的直观理解不一样。为清晰起见，请查看文档和注"
"释。" "释。"
#: src/std-traits/casting.md #: src/std-traits/casting.md
@ -7022,6 +7021,9 @@ msgid ""
"selecting the bottom 32 bits of a `u64` with `as u32`, regardless of what " "selecting the bottom 32 bits of a `u64` with `as u32`, regardless of what "
"was in the high bits)." "was in the high bits)."
msgstr "" msgstr ""
"使用 `as` 进行类型转换是一种快捷好用但容易出错的方法，也在未来进行代码更新"
"时，比如改变了类型或类型范围时会导致潜伏的 Bug。 类型转换最好是用于明确是要进"
"行无条件截取（比如截取低位的 `u64` 为 `u32`，忽略高位的数值）。"
#: src/std-traits/casting.md #: src/std-traits/casting.md
msgid "" msgid ""
@ -7030,13 +7032,15 @@ msgid ""
"casts, `TryFrom` and `TryInto` are available when you want to handle casts " "casts, `TryFrom` and `TryInto` are available when you want to handle casts "
"that fit differently from those that don't." "that fit differently from those that don't."
msgstr "" msgstr ""
"对于绝对不会出错的转换（比如 `u32` 转 `u64`），相比 `as`，更推荐用 `From` 或 "
"`Into` 以肯定该转换是不会出错的。对于可能出错的转换，如果你想对这些不能成功转"
"换的情况有不同处理方案时，可以考虑 `TryFrom` 和 `TryInto`。"
#: src/std-traits/casting.md #: src/std-traits/casting.md
msgid "Consider taking a break after this slide." msgid "Consider taking a break after this slide."
msgstr "请在这张幻灯片之后休息一下。" msgstr "请在这张幻灯片之后休息一下。"
#: src/std-traits/casting.md #: src/std-traits/casting.md
#, fuzzy
msgid "" msgid ""
"`as` is similar to a C++ static cast. Use of `as` in cases where data might " "`as` is similar to a C++ static cast. Use of `as` in cases where data might "
"be lost is generally discouraged, or at least deserves an explanatory " "be lost is generally discouraged, or at least deserves an explanatory "
@ -7047,7 +7051,7 @@ msgstr ""
#: src/std-traits/casting.md #: src/std-traits/casting.md
msgid "This is common in casting integers to `usize` for use as an index." msgid "This is common in casting integers to `usize` for use as an index."
msgstr "在将整数类型转换为 `usize` 以用作索引时，这很常见。" msgstr "会经常遇到的是，将整数类型转换为 `usize` 以用作索引。"
#: src/std-traits/read-and-write.md #: src/std-traits/read-and-write.md
msgid "" msgid ""
@ -15972,10 +15976,10 @@ msgid ""
"`allow-first-party-usage=false`. There are several examples already in that " "`allow-first-party-usage=false`. There are several examples already in that "
"file:" "file:"
msgstr "" msgstr ""
"如果是，请修改 [`gnrt_config.toml`](../configuration-gnrt-config-toml.md)，" "如果是，请修改 [`gnrt_config.toml`](../configuring-gnrt-config-toml.md)，将 "
"将 `build-script-outputs` 添加到 crate。如果这是一个传递依赖项（即 Chromium " "`build-script-outputs` 添加到 crate。如果这是一个传递依赖项（即 Chromium 代码"
"代码不应直接依赖的依赖项），还要添加 `allow-first-party-usage=false`。该文件" "不应直接依赖的依赖项），还要添加 `allow-first-party-usage=false`。该文件中已"
"中已经提供了若干示例：" "经提供了若干示例："
#: src/chromium/adding-third-party-crates/resolving-problems/build-scripts-which-generate-code.md #: src/chromium/adding-third-party-crates/resolving-problems/build-scripts-which-generate-code.md
#, fuzzy #, fuzzy