我想将HTML片段存储在YAML文件中.最好的方法是什么?
就像是:
myhtml: |
<div>
<a href="#">whatever</a>
</div>
Run Code Online (Sandbox Code Playgroud) 你如何进行下面的查询,我想在伦敦或其他名字中有希尔顿的酒店?
此查询db.hotels.find({$ where:"name =/hilton/i || city =/london/i"})
出现这样的错误错误:{"$ err":"$ where compile error"}
两个查询分别正常工作:db.hotels.find({$ where:"city =/london/i"})db.hotels.find({$ where:"name =/hilton/i"})
我想为FromStr具有生命周期参数的结构实现:
use std::str::FromStr;
struct Foo<'a> {
bar: &'a str,
}
impl<'a> FromStr for Foo<'a> {
type Err = ();
fn from_str(s: &str) -> Result<Foo<'a>, ()> {
Ok(Foo { bar: s })
}
}
pub fn main() {
let foo: Foo = "foobar".parse().unwrap();
}
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但是,编译器抱怨:
error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
--> src/main.rs:11:12
|
11 | Ok(Foo { bar: s })
| ^^^
|
help: consider using an explicit lifetime parameter as shown: fn from_str(s: …Run Code Online (Sandbox Code Playgroud) 我有一个带有标签的数组,这是一个文件的一部分,例如["红色","绿色","蓝色","白色","黑色"]
现在我想找到所有有红色和蓝色的文件.