Use MaybeUninit instead of mem::uninitialized

core-foundation/src/filedescriptor.rs

@@ -15,7 +15,7 @@ use core_foundation_sys::base::{kCFAllocatorDefault, CFOptionFlags};
 use base::TCFType;
 use runloop::CFRunLoopSource;
 
-use std::mem;
+use std::mem::MaybeUninit;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::ptr;
 
@@ -46,9 +46,9 @@ impl CFFileDescriptor {
 
     pub fn context(&self) -> CFFileDescriptorContext {
         unsafe {
-            let mut context: CFFileDescriptorContext = mem::uninitialized();
-            CFFileDescriptorGetContext(self.0, &mut context);
-            context
+            let mut context = MaybeUninit::<CFFileDescriptorContext>::uninit();
+            CFFileDescriptorGetContext(self.0, context.as_mut_ptr());
+            context.assume_init()
         }
     }
 

core-foundation/src/url.rs

@@ -16,9 +16,9 @@ use string::{CFString};
 
 use core_foundation_sys::base::{kCFAllocatorDefault, Boolean};
 use std::fmt;
+use std::mem::MaybeUninit;
 use std::ptr;
 use std::path::{Path, PathBuf};
-use std::mem;
 
 use libc::{c_char, strlen, PATH_MAX};
 
@@ -78,13 +78,15 @@ impl CFURL {
     pub fn to_path(&self) -> Option<PathBuf> {
         // implementing this on Windows is more complicated because of the different OsStr representation
         unsafe {
-            let mut buf: [u8; PATH_MAX as usize] = mem::uninitialized();
-            let result = CFURLGetFileSystemRepresentation(self.0, true as Boolean, buf.as_mut_ptr(), buf.len() as CFIndex);
+            let mut buf = MaybeUninit::<[u8; PATH_MAX as usize]>::uninit();
+            let result = CFURLGetFileSystemRepresentation(self.0, true as Boolean, buf.as_mut_ptr() as *mut u8, PATH_MAX as CFIndex);
             if result == false as Boolean {
                 return None;
             }
-            let len = strlen(buf.as_ptr() as *const c_char);
-            let path = OsStr::from_bytes(&buf[0..len]);
+
+            let buf_init = buf.assume_init();
+            let len = strlen(buf_init.as_ptr() as *const c_char);
+            let path = OsStr::from_bytes(&buf_init[0..len]);
             Some(PathBuf::from(path))
         }
     }