从文字创建字符串的首选方法是什么? [英] What's the preferred way to create a String from a literal?

问题描述

为了从 Rust 中的文字创建字符串，是否有更喜欢以下形式之一的性能或风格原因?

Is there a performance or stylistic reason to prefer one of the following forms for creating a String from a literal in Rust?

"hello world".to_string()
format!("hello world")
String::from("hello world")

推荐答案

Rust 编译器内部的惯用方式，因此 Rust 通常使用 to_string.它是在编译器中以这种方式完成的，并由 Alex Crichton 在三个拉取请求中提供支持 (1、2、3) 试图改变这一点.

The idiomatic way in the Rust compiler internals and thus Rust in general is to use to_string. It is done this way in the compiler and backed by Alex Crichton in three pull requests (1, 2, 3) that tried to change this.

论点是 to_string 最清楚地定义了你想要什么.to_string 和 format! 在性能方面都比 String::from 慢.但是一旦我们获得了 impl 专业化，它们很有可能会执行完全相同的操作.

The argument is that to_string most clearly defines what you want. Performance-wise both to_string and format! are slower than String::from. But once we get impl specialization there's a good chance that they will perform exactly the same.

也就是说，clippy lints 对 "abc".to_string() 并建议 "abc".to_owned().

That said, clippy lints against "abc".to_string() and suggests "abc".to_owned().

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