Rust如何从数组转换为std :: raw ::: Slice

Question

std::raw::Slice is defined as :

pub struct Slice<T> {
    pub data: *const T,
    pub len: uint,
}

I am trying something like this:

use std::raw::Slice as RawSlice;
let a = [1i,2,3,4];
let s : RawSlice<int>= RawSlice{data: a as *const int, 
        len : a.len()};

This doesn't compile. error: non-scalar cast: [int, ..4] as *const int . I am basically unable to figure out how to get a pointer to the beginning of the array.

A similar concern is: how to convert from [int] to *const int?

Answer 1

您可以获取指向数组的第一个元素的指针并进行转换：

&a[0] as *const int