1 use crate::rust_string::RustString; 2 use alloc::string::String; 3 use alloc::vec::Vec; 4 use core::mem::ManuallyDrop; 5 6 #[repr(C)] 7 pub struct RustVec<T> { 8 pub(crate) repr: Vec<T>, 9 } 10 11 impl<T> RustVec<T> { new() -> Self12 pub fn new() -> Self { 13 RustVec { repr: Vec::new() } 14 } 15 from(v: Vec<T>) -> Self16 pub fn from(v: Vec<T>) -> Self { 17 RustVec { repr: v } 18 } 19 from_ref(v: &Vec<T>) -> &Self20 pub fn from_ref(v: &Vec<T>) -> &Self { 21 unsafe { &*(v as *const Vec<T> as *const RustVec<T>) } 22 } 23 from_mut(v: &mut Vec<T>) -> &mut Self24 pub fn from_mut(v: &mut Vec<T>) -> &mut Self { 25 unsafe { &mut *(v as *mut Vec<T> as *mut RustVec<T>) } 26 } 27 into_vec(self) -> Vec<T>28 pub fn into_vec(self) -> Vec<T> { 29 self.repr 30 } 31 as_vec(&self) -> &Vec<T>32 pub fn as_vec(&self) -> &Vec<T> { 33 &self.repr 34 } 35 as_mut_vec(&mut self) -> &mut Vec<T>36 pub fn as_mut_vec(&mut self) -> &mut Vec<T> { 37 &mut self.repr 38 } 39 len(&self) -> usize40 pub fn len(&self) -> usize { 41 self.repr.len() 42 } 43 as_ptr(&self) -> *const T44 pub fn as_ptr(&self) -> *const T { 45 self.repr.as_ptr() 46 } 47 reserve_total(&mut self, cap: usize)48 pub fn reserve_total(&mut self, cap: usize) { 49 let len = self.repr.len(); 50 if cap > len { 51 self.repr.reserve(cap - len); 52 } 53 } 54 set_len(&mut self, len: usize)55 pub unsafe fn set_len(&mut self, len: usize) { 56 self.repr.set_len(len); 57 } 58 } 59 60 impl RustVec<RustString> { from_vec_string(v: Vec<String>) -> Self61 pub fn from_vec_string(v: Vec<String>) -> Self { 62 let mut v = ManuallyDrop::new(v); 63 let ptr = v.as_mut_ptr().cast::<RustString>(); 64 let len = v.len(); 65 let cap = v.capacity(); 66 Self::from(unsafe { Vec::from_raw_parts(ptr, len, cap) }) 67 } 68 from_ref_vec_string(v: &Vec<String>) -> &Self69 pub fn from_ref_vec_string(v: &Vec<String>) -> &Self { 70 Self::from_ref(unsafe { &*(v as *const Vec<String> as *const Vec<RustString>) }) 71 } 72 from_mut_vec_string(v: &mut Vec<String>) -> &mut Self73 pub fn from_mut_vec_string(v: &mut Vec<String>) -> &mut Self { 74 Self::from_mut(unsafe { &mut *(v as *mut Vec<String> as *mut Vec<RustString>) }) 75 } 76 into_vec_string(self) -> Vec<String>77 pub fn into_vec_string(self) -> Vec<String> { 78 let mut v = ManuallyDrop::new(self.repr); 79 let ptr = v.as_mut_ptr().cast::<String>(); 80 let len = v.len(); 81 let cap = v.capacity(); 82 unsafe { Vec::from_raw_parts(ptr, len, cap) } 83 } 84 as_vec_string(&self) -> &Vec<String>85 pub fn as_vec_string(&self) -> &Vec<String> { 86 unsafe { &*(&self.repr as *const Vec<RustString> as *const Vec<String>) } 87 } 88 as_mut_vec_string(&mut self) -> &mut Vec<String>89 pub fn as_mut_vec_string(&mut self) -> &mut Vec<String> { 90 unsafe { &mut *(&mut self.repr as *mut Vec<RustString> as *mut Vec<String>) } 91 } 92 } 93