/// 361 | let d = a.unwrap(); /// | - --- `a` moved due to this method call /// | | /// | help: consider calling `.as_ref()` or `.as_mut()` to borrow the type's contents /// 362 | // cannot use 'a' again. /// 363 |println!("{:?}", a); /// | ^...
into_iter(); // std::vec::IntoIter<{integer}> // --- `v3` moved due to this method call assert_eq!(Some(1), v3_iter.next()); assert_eq!(Some(2), v3_iter.next()); assert_eq!(Some(3), v3_iter.next()); assert_eq!(None, v3_iter.next()); // println!("v3 = {:?
("get num {}", num.get_num()); | --- `num` moved due to this method call 15 | println!("get num {}", num.get_num()); | ^^^ value used here after move | note: this function consumes the receiver `self` by taking ownership of it, which moves `num` --> src/main.rs:...
48|letopt=Some("hello".to_string());|---moveoccurs because `opt` hastype`Option<String>`,which does not implement the `Copy`trait49|lets=opt.unwrap();|---`opt` moved due to this method call50|51|println!("{:?}",opt);|^^^value borrowed here aftermove| 引用 move语义会转移所有...
[1, 2, 3, 4, -1, 5, 6, 7,8].into_iter();|--- move occurs because`iter`hastype`std::vec::IntoIter<i32>`, which does not implement the`Copy`trait 3|iter.take_while(|x|*x>0);|---`iter`moved due to this method call 4|assert_eq!(iter.next(), Some(5));|^^^ value...
The sparse protocol is set to become the default for crates.io in Rust 1.70.0, which is due in a few months. Elsewhere in Rust 1.68.0, a new pin! macro constructs a Pin<&mut T> from a T expression, anonymously captured in local state. This often is called stack pinning, but that...
在 Rust 中，迭代器（iterators）是一种提供序列化访问元素的抽象方式。迭代器允许我们对集合中的元素...
方法(Method) Trait 方法是指,第一个参数使用了self关键字并且self的类型是Self,&Self,&mut Self之一。self的类型也可以被Box,Rc,Arc或Pin来包装。 traitTrait{// methodsfntakes_self(self);fntakes_immut_self(&self);fntakes_mut_self(&mutself);// above methods desugaredfntakes_self(self:Self);fn...
method(); } fn main() { let x = "Hello".to_string(); do_something(&x); } 上面函数do_something的参数是&Foo,是一个引用。这很关键,这就会使用dynamic dispatch。 具体实现区别涉及到指针和vtable等,请看官方文档。(有时间补充上) 5.24 Closures 闭包 有一种是stack closure,是在栈上的closure。
("{}",y);|-borrow later used hereerror:aborting due to previous error 这个例子执行会报错,原因显而易见,y要引用变量x, 但是x在语句块 {} 中,离开这个词法作用域后就失效了,y就成了悬垂空引用肯定不行。 代码语言:javascript 复制 fnmain(){letmut a=String::from("hello");leta_ref=&mut a;...