你如何启用 Rust 的“板条箱功能"? [英] How do you enable a Rust "crate feature"?
问题描述
我正在尝试使用 rand::SmallRng
.文档说
I'm trying to use rand::SmallRng
. The documentation says
此 PRNG 是功能门控:要使用,您必须启用 crate 功能 small_rng
.
This PRNG is feature-gated: to use, you must enable the crate feature
small_rng
.
我一直在搜索,但不知道如何启用板条箱功能".Rust 文档中的任何地方都没有使用该短语.这是我能想到的最好的:
I've been searching and can't figure out how to enable "crate features". The phrase isn't even used anywhere in the Rust docs. This is the best I could come up with:
[features]
default = ["small_rng"]
但我明白了:
Feature default
包括 small_rng
既不是依赖项也不是另一个特性
Feature
default
includessmall_rng
which is neither a dependency nor another feature
文档有误,还是我遗漏了什么?
Are the docs wrong, or is there something I'm missing?
推荐答案
在 Cargo.toml 中指定依赖项,如下所示:
Specify the dependencies in Cargo.toml like so:
[dependencies]
rand = { version = "0.7.2", features = ["small_rng"] }
或者:
[dependencies.rand]
version = "0.7.2"
features = ["small_rng"]
两者都有效.
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