问题描述
我正在尝试 Rust Edition 2018 .在Rust 2015中，您使用
I'm experimenting with Rust Edition 2018. In Rust 2015 you use
#[macro_use]
extern crate log;
用于导入宏.在Rust 2018中，extern crate可能很简单.有没有一种方法可以在不使用extern crate的情况下从板条箱中导入所有宏?对于简单的宏，将其导入模块很好，但是复杂的宏依赖于其他几个宏，这很不方便.
for importing macros. In Rust 2018 extern crate is probably unidiomatic. Is there a way, to import all macros from the crate without extern crate? For simple macros, importing it in the modules is fine, but complicated macros depend on several other macros, which is unhandy.
推荐答案
我看不到任何仅导入 宏的方法，但是如果可以导入所有基本对象， crate提供，通常应通过以下方式获取所有宏:
I don't see any way of importing only all the macros, but if you are fine with importing all the essential objects a crate provides, you should usually get all the macros by writing:
use the_crate_with_macros::*;
或
use the_crate_with_macros::prelude::*; // if available
从1.30版开始，这也适用于Rust 2015.
This also works in Rust 2015 starting in version 1.30.
这篇关于如何在Rust 2018中导入所有宏，派生和过程宏而不使用外部包装箱?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！