Change get_allocated_bytes return to be usize

src/array.rs

@@ -4,7 +4,7 @@ use dim4::Dim4;
 use defines::{AfError, DType, Backend};
 use error::HANDLE_ERROR;
 use util::{AfArray, DimT, HasAfEnum, MutAfArray, MutVoidPtr};
-use self::libc::{uint8_t, c_void, c_int, c_uint, c_longlong, c_ulong, c_char};
+use self::libc::{uint8_t, c_void, c_int, c_uint, c_longlong, c_char};
 use std::ffi::CString;
 
 // Some unused functions from array.h in C-API of ArrayFire
@@ -101,7 +101,7 @@ extern {
 
     fn af_get_device_ptr(ptr: MutVoidPtr, arr: AfArray) -> c_int;
 
-    fn af_get_allocated_bytes(result: *mut c_ulong, arr: AfArray) -> c_int;
+    fn af_get_allocated_bytes(result: *mut usize, arr: AfArray) -> c_int;
 }
 
 /// A multidimensional data container
@@ -412,10 +412,10 @@ impl Array {
     ///
     /// This function will return the size of the parent/owner if the current Array object is an
     /// indexed Array.
-    pub fn get_allocated_bytes(&self) -> u64 {
+    pub fn get_allocated_bytes(&self) -> usize {
         unsafe {
-            let mut temp: u64 = 0;
-            let err_val = af_get_allocated_bytes(&mut temp as *mut c_ulong, self.handle as AfArray);
+            let mut temp: usize = 0;
+            let err_val = af_get_allocated_bytes(&mut temp as *mut usize, self.handle as AfArray);
             HANDLE_ERROR(AfError::from(err_val));
             temp
         }