August 2018
Intermediate to advanced
608 pages
15h 28m
Japanese
Content preview from プログラミングRust
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166
8 章 クレートとモジュール
モジュール
モジュールについては既にかなり説明した。既に見た通り、モジュールはサブモジュールから
構成され、他の名前付きアイテムと同じくパブリックとプライベートがある。
インポート
use
宣言や
extern crate
宣言もアイテムだ。これらは単に別名を付けるだけなのだが、パブ
リックにすることもできる。
// in plant_structures/mod.rs
...
pub use self::leaves::Leaf;
pub use self::roots::Root;
こうすると、
Leaf
と
Root
が
plant_structures
のパブリックアイテムとなる。これらは
plant_structures::leaves::Leaf
と
plant_structures::roots::Root
の別名にすぎない。
標準のプレリュードも、一連のこのようなパブリックインポートとして書かれている。
extern
ブロック
extern
ブロックでは、他の言語（多くの場合は
C
あるいは
C++
）で書かれた一連の関数を宣
言して、
Rust
コードから呼び出せるようにするために用いられる。
extern
ブロックについて
は、
21
章で説明する。
Rust
は宣言だけされて、使われていないアイテムがあると警告を出力する。
warning: function is never used: `is_square` `is_square`
関数が使われていない
--> src/crates_unused_items.rs:23:9 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.