1 use alloc::string::String;
2 use core::mem;
3 
4 #[repr(C)]
5 pub struct RustString {
6     repr: String,
7 }
8 
9 impl RustString {
from(s: String) -> Self10     pub fn from(s: String) -> Self {
11         RustString { repr: s }
12     }
13 
from_ref(s: &String) -> &Self14     pub fn from_ref(s: &String) -> &Self {
15         unsafe { &*(s as *const String as *const RustString) }
16     }
17 
from_mut(s: &mut String) -> &mut Self18     pub fn from_mut(s: &mut String) -> &mut Self {
19         unsafe { &mut *(s as *mut String as *mut RustString) }
20     }
21 
into_string(self) -> String22     pub fn into_string(self) -> String {
23         self.repr
24     }
25 
as_string(&self) -> &String26     pub fn as_string(&self) -> &String {
27         &self.repr
28     }
29 
as_mut_string(&mut self) -> &mut String30     pub fn as_mut_string(&mut self) -> &mut String {
31         &mut self.repr
32     }
33 }
34 
35 const_assert_eq!(mem::size_of::<[usize; 3]>(), mem::size_of::<String>());
36 const_assert_eq!(mem::align_of::<usize>(), mem::align_of::<String>());
37