元组结构构造函数是函数.您可以将函数和闭包作为参数传递给其他函数.

Tuple struct constructors are functions. You can pass functions and closures as arguments to other functions.

pub struct String10(String);
pub struct String20(String);

impl String10 {
    pub fn create(field_name: &str, s: &str) -> String10 {
        create_string(field_name, String10, 10, s)
    }
}

impl String20 {
    pub fn create(field_name: &str, s: &str) -> String20 {
        create_string(field_name, String20, 20, s)
    }
}

pub fn create_string<T>(
    _field_name: &str,
    ctor: impl FnOnce(String) -> T,
    _max_len: u32,
    s: &str,
) -> T {
    ctor(s.to_string())
}

另见:

• 在 Rust 中，如何将函数作为参数传递?