复制代码 3.可变引用传递(Pass by mutable reference):当参数是可变引用(&mut)时,会发生可变引用传递。这意味着在函数内部对参数所做的修改会影响到原始变量,并且允许修改参数的值。fn add_mut(a: &mut i32, b: &mut i32) -> i32 { *a + *b } fn main() { let mut x = 1; let mut y = 2;...
我们将引用 (&v)(又名pass-by-reference)而非所有权(即pass-by-value)传递给print_vector函数。因此在main函数中调用print_vector函数后,我们就可以访问v了。 1.通过解引用运算符跟踪指针的指向数据 如前所述,引用是指针的一种类型,可以将指针视为指向存储在其他位置的数据的箭头。下面是一个示例: letx = 5...
我们将引用 (&v)(又名pass-by-reference)而非所有权(即pass-by-value)传递给print_vector函数。因此在main函数中调用print_vector函数后,我们就可以访问v了。 1.通过解引用运算符跟踪指针的指向数据 如前所述,引用是指针的一种类型,可以将指针视为指向存储在其他位置的数据的箭头。下面是一个示例: 复制 let x...
letmut x =10; foo(x);// pass by move, x cannot be used after the call foo(&x);// pass by immutable reference foo(&mut x);// pass by mutable reference 统一的错误处理 错误处理一直是C++中一个非常分裂的地方,截止C++23,目前C++标准库中,有以下用于错误处理的功能: errno std::exception s...
letmutx=10;foo(x);// pass by move, x cannot be used after the callfoo(&x);// pass by immutable referencefoo(&mutx);// pass by mutable reference 统一的错误处理 错误处理一直是C++中一个非常分裂的地方,截止C++23,目前C++标准库中,有以下用于错误处理的功能: ...
change(&mut s); // Mutable borrow println!("{}", s); // s is now modified } fn change(s: &mut String) { s.push_str(", Rust!"); // Modifies the borrowed string } In this example,sis declared as mutable, and we pass a mutable reference to thechangefunction. The&mutkeyword ...
// pass a mutable string when calling the functionchange(&mutstr); // after modifying the stringprintln!("After: str = {}",str); } fnchange(s: &mutString) {// push a string to the mutable reference variables.push_str(", World!"); } ...
// We pass a mutable reference add_one(&mutnumbers); // We pass a reference again print_vec(&numbers); } It’s instructive to explore these two code fragments and find similarities and differences between them by yourself. Even without understanding Rust, you might get a general feeling fo...
fnreference_pass(some_string:&String)->usize{some_string.push_str("test");// cannot borrow `*some_string` as mutable, as it is behind a `&` reference `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutablesome_string.len()} ...
(my_lint_function_name_is_feature::my_lint_function_name_is_feature), @@ -1702,6 +1705,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(mut_key::MUTABLE_KEY_TYPE), + LintId::of(my_lint_function_name_is_feature::my_lint_...