refactor: delete map for State and expose struct with lifetime

src/whisper_state.rs

@@ -1,13 +1,16 @@
+use std::marker::PhantomData;
+
 /// Rustified pointer to a Whisper state.
 #[derive(Debug)]
-pub struct WhisperState {
+pub struct WhisperState<'a> {
     ptr: *mut whisper_rs_sys::whisper_state,
+    _phantom: PhantomData<&'a ()>,
 }
 
-unsafe impl Send for WhisperState {}
-unsafe impl Sync for WhisperState {}
+unsafe impl<'a> Send for WhisperState<'a> {}
+unsafe impl<'a> Sync for WhisperState<'a> {}
 
-impl Drop for WhisperState {
+impl<'a> Drop for WhisperState<'a> {
     fn drop(&mut self) {
         unsafe {
             whisper_rs_sys::whisper_free_state(self.ptr);
@@ -15,9 +18,12 @@ impl Drop for WhisperState {
     }
 }
 
-impl WhisperState {
-    pub(crate) unsafe fn new(ptr: *mut whisper_rs_sys::whisper_state) -> Self {
-        Self { ptr }
+impl<'a> WhisperState<'a> {
+    pub(crate) fn new(ptr: *mut whisper_rs_sys::whisper_state) -> Self {
+        Self {
+            ptr,
+            _phantom: PhantomData,
+        }
     }
 
     pub(crate) fn as_ptr(&self) -> *mut whisper_rs_sys::whisper_state {