走进 Rust：Drop trait
Rust 大约 603 字实现 Drop
实现Drop trait用于手动清理某个值，例如锁。
struct CustomSmartPointer {
data: String,
}
impl Drop for CustomSmartPointer {
fn drop(&mut self) {
println!("Dropping CustomSmartPointer with data `{}`!", self.data);
}
}调用 drop 方法
使用std::mem::drop函数
fn main() {
let c = CustomSmartPointer { data: String::from("some data") };
println!("CustomSmartPointer created.");
drop(c);
println!("CustomSmartPointer dropped before the end of main.");
}输出
CustomSmartPointer created.
Dropping CustomSmartPointer with data `some data`!
CustomSmartPointer dropped before the end of main.
阅读 376 · 发布于 2020-08-25
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