<分区>
此代码编译:
struct IntDisplayable(Vec<u8>);
impl fmt::Display for IntDisplayable {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for v in &self.0 {
write!(f, "\n{}", v)?;
}
Ok(())
}
}
fn main() {
let vec: Vec<u8> = vec![1,2,3,4,5];
let vec_Foo = IntDisplayable(vec);
println!("{}",vec_Foo);
}
虽然这段代码没有:
struct StrDisplayable(Vec<&str>);
impl fmt::Display for StrDisplayable {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for v in &self.0 {
write!(f, "\n{}", v)?;
}
Ok(())
}
}
fn main() {
let vec: Vec<&str> = vec!["a","bc","def"];
let vec_Foo = StrDisplayable(vec);
println!("{}",vec_Foo);
}
错误信息:
error[E0106]: missing lifetime specifier
--> src/lib.rs:3:27
|
3 | struct StrDisplayable(Vec<&str>);
| ^ expected lifetime parameter
我想做的是实现 fmt::Display对于 Vec<&str> ，通常需要包装 Vec喜欢this , 但它只适用于 Vec<u8> , 为什么要替换 Vec<u8>进入Vec<&str>导致这样的编译错误？