Move stuff around

nix-rust/src/foreign.rs

@@ -12,3 +12,22 @@ impl std::io::Read for Source {
         Ok(n)
     }
 }
+
+pub struct CBox<T> {
+    pub ptr: *mut libc::c_void,
+    phantom: std::marker::PhantomData<T>,
+}
+
+impl<T> CBox<T> {
+    pub fn new(t: T) -> Self {
+        unsafe {
+            let size = std::mem::size_of::<T>();
+            let ptr = libc::malloc(size);
+            *(ptr as *mut T) = t; // FIXME: probably UB
+            Self {
+                ptr,
+                phantom: std::marker::PhantomData,
+            }
+        }
+    }
+}