Extracted the preupdate_hook to a separate cargo feature.

Moved hooks and preupdate_hook into their own modules inside hooks.rs
Also created an initial way to access the functions that are available
during the callback.

Cargo.toml

@@ -37,7 +37,8 @@ trace = ["libsqlite3-sys/min_sqlite_version_3_6_23"]
 bundled = ["libsqlite3-sys/bundled", "modern_sqlite"]
 buildtime_bindgen = ["libsqlite3-sys/buildtime_bindgen"]
 limits = []
-hooks = ["libsqlite3-sys/preupdate_hook"]
+hooks = []
+preupdate_hook = ["libsqlite3-sys/preupdate_hook"]
 i128_blob = ["byteorder"]
 sqlcipher = ["libsqlite3-sys/sqlcipher"]
 unlock_notify = ["libsqlite3-sys/unlock_notify"]

src/inner_connection.rs

@@ -33,7 +33,7 @@ pub struct InnerConnection {
     pub free_update_hook: Option<unsafe fn(*mut ::std::os::raw::c_void)>,
     #[cfg(feature = "hooks")]
     pub progress_handler: Option<Box<dyn FnMut() -> bool + Send>>,
-    #[cfg(feature = "hooks")]
+    #[cfg(feature = "preupdate_hook")]
     pub free_preupdate_hook: Option<unsafe fn(*mut ::std::os::raw::c_void)>,
     owned: bool,
 }
@@ -52,9 +52,9 @@ impl InnerConnection {
             #[cfg(feature = "hooks")]
             free_update_hook: None,
             #[cfg(feature = "hooks")]
-            free_preupdate_hook: None,
-            #[cfg(feature = "hooks")]
             progress_handler: None,
+            #[cfg(feature = "preupdate_hook")]
+            free_preupdate_hook: None,
             owned,
         }
     }
@@ -155,6 +155,7 @@ impl InnerConnection {
             return Ok(());
         }
         self.remove_hooks();
+        self.remove_preupdate_hook();
         let mut shared_handle = self.interrupt_lock.lock().unwrap();
         assert!(
             !shared_handle.is_null(),
@@ -305,6 +306,10 @@ impl InnerConnection {
     #[cfg(not(feature = "hooks"))]
     #[inline]
     fn remove_hooks(&mut self) {}
+
+    #[cfg(not(feature = "preupdate_hook"))]
+    #[inline]
+    fn remove_preupdate_hook(&mut self) {}
 }
 
 impl Drop for InnerConnection {

src/lib.rs

@@ -101,8 +101,8 @@ pub mod config;
 mod context;
 #[cfg(feature = "functions")]
 pub mod functions;
-#[cfg(feature = "hooks")]
-mod hooks;
+#[cfg(any(feature = "hooks", feature = "preupdate_hook"))]
+pub mod hooks;
 mod inner_connection;
 #[cfg(feature = "limits")]
 pub mod limits;

src/types/value_ref.rs

@@ -133,7 +133,12 @@ where
     }
 }
 
-#[cfg(any(feature = "functions", feature = "session", feature = "vtab"))]
+#[cfg(any(
+    feature = "functions",
+    feature = "session",
+    feature = "vtab",
+    feature = "preupdate_hook"
+))]
 impl<'a> ValueRef<'a> {
     pub(crate) unsafe fn from_value(value: *mut crate::ffi::sqlite3_value) -> ValueRef<'a> {
         use crate::ffi;