Refactor Stat

src/environment.rs

@@ -162,7 +162,7 @@ impl Environment {
     pub fn stat(&self) -> Result<Stat> {
         unsafe {
             let mut stat = Stat::new();
-            lmdb_try!(ffi::mdb_env_stat(self.env(), &mut stat.0));
+            lmdb_try!(ffi::mdb_env_stat(self.env(), stat.mdb_stat()));
             Ok(stat)
         }
     }
@@ -247,16 +247,21 @@ impl Environment {
 
 /// Environment statistics.
 ///
-/// Contains information about the size and layout of an LMDB environment.
-pub struct Stat(pub(crate) ffi::MDB_stat);
+/// Contains information about the size and layout of an LMDB environment or database.
+pub struct Stat(ffi::MDB_stat);
 
 impl Stat {
     /// Create a new Stat with zero'd inner struct `ffi::MDB_stat`.
-    pub fn new() -> Stat {
+    pub(crate) fn new() -> Stat {
         unsafe {
             Stat(mem::zeroed())
         }
     }
+
+    /// Returns a mut pointer to `ffi::MDB_stat`.
+    pub(crate) fn mdb_stat(&mut self) -> *mut ffi::MDB_stat {
+        &mut self.0
+    }
 }
 
 impl Stat {

src/transaction.rs

@@ -107,7 +107,7 @@ pub trait Transaction : Sized {
     fn stat(&self, db: Database) -> Result<Stat> {
         unsafe {
             let mut stat = Stat::new();
-            lmdb_try!(ffi::mdb_stat(self.txn(), db.dbi(), &mut stat.0));
+            lmdb_try!(ffi::mdb_stat(self.txn(), db.dbi(), stat.mdb_stat()));
             Ok(stat)
         }
     }