我很难在Rust中寻找指针。由于以下原因，该代码无法编译wrong number of lifetime parameters: expected 1, found 0 [E0107]。那是什么意思？
struct Planet<'a> {
name: &'a str,
radius_km: i32,
surface_area_km2: i64,
orbital_period_days: i32,
distance_from_sun: i64
}
fn mercury() -> Planet {
Planet {
name: "Mercury",
radius_km: 2_440,
surface_area_km2: 74_800_000,
orbital_period_days: 88,
distance_from_sun: 57_910_000
}
}
fn main() {
let mercury = Box::new(mercury());
println!("{}",mercury.name)
}
就是说，您对struct的定义包括一个类型参数，因此，创建该参数的函数也必须如此。
struct Planet<'a>{
name : &'a str,
radius_km: i32,
surface_area_km2: i64,
orbital_period_days: i32,
distance_from_sun: i64
}
fn mercury<'a>()->Planet<'a>{
Planet{
name:"Mercudy",
radius_km: 2_440,
surface_area_km2: 74_800_000,
orbital_period_days: 88,
distance_from_sun: 57_910_000
}
}
fn main(){
let planet = mercury();
println!("{}", planet.name)
}
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我来说两句