fn main() { let s1 = String::from("hello"); let h = s1[0]; } 错误如下: 代码语言:shell AI代码解释 error[E0277]: the type `str` cannot be indexed by `{integer}` --> src/main.rs:73:16 | 73 | let h = s1[0]; | ^ string indices
error[E0277]: the type `str` cannot be indexed by `{integer}` --> src/main.rs:20:10 | 20 | let c = s[0]; | ^^^ string indices are ranges of `usize` | = help: the trait `std::slice::SliceIndex<str>` is not implemented for `{integer}` = note: you can use `.chars...
error[E0277]: the type `[[u8; 3]]` cannot be indexed by `u8` --> src/main.rs:13:9 | 13 | self.grid[m.x][m.y] = 1; | ^^^ slice indices are of type `usize` or ranges of `usize` | = help: the trait `SliceIndex<[[u8; 3]]>` is not implemented for `u8` = not...
// the virtual address whose corresponding page tables you want to accessletaddr:usize= […];letr =0o777;// recursive indexletsign =0o177777<<48;// sign extension// retrieve the page table indices of the address that we want to translateletl4_idx = (addr >>39)&0o777;// level 4 ...
fn calculate_length(s: &String) -> usize { s.len() } First, notice that all the tuple code in the variable declaration and the function return value is gone. Second, note that we pass&s1intocalculate_lengthand, in its definition, we take&Stringrather thanString. These ampersands rep...
lets:String=scan.next();letv:Vec<bool>=s.chars().map(|ch|ch==‘1’).collect(); My 1168C submission features the following rather magical line: let(zero_bits,one_bits):(Vec<usize>,Vec<usize>)=(0..BITS).partition(|b|(ai&(1usize<...
| ^^^ slice indices are of type `usize` or ranges of `usize` | = help: the trait `std::slice::SliceIndex<[u8]>` is not implemented for `u8` = note: required because of the requirements on the impl of `std::ops::Index` for `[u8]` 虽然这可以理解,但要求程序...
rust usize to i32 rust expected slice `[&str]` found tuple `(_, _, _)` refutable pattern in function argument cannot return value referencing local variable ``` ### Next Steps 1. Figure out if Vectors are even the right approach for this kind of thing; I think I'm doing it wrong...
Check both ranges to see if either fully contains the otherThe second part introduces another common Advent of Code puzzle trope: Switching between a complete and partial match. So we just need to flip our .all() to a .any() and we're good to go.Take...
writing-an-os-in-rust/09-paging-implementation.md Go to file Go to file T Go to line L Copy path Copy permalink Cannot retrieve contributors at this time 简介 访问页表 恒等映射 以固定偏移量映射 映射整个物理内存 临时映射 递归页表 Rust代码 Bootloader 支持 引导信息 entry_point宏 实现 访...