downcast

Cargo.toml

@@ -14,4 +14,4 @@ id3 = "0.5.1"
 mp4ameta = "0.6"
 metaflac = "0.2"
 thiserror = "1.0.21"
-audiotags-dev-macro = {path = "./audiotags-dev-macro", version = "0.1.1"}
+audiotags-dev-macro = {path = "./audiotags-dev-macro", version = "0.1.2"}

audiotags-dev-macro/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "audiotags-dev-macro"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Tianyi <ShiTianyi2001@outlook.com>"]
 edition = "2018"
 description = "macros used during the development of audiotags"

audiotags-dev-macro/src/lib.rs

@@ -37,13 +37,16 @@ macro_rules! impl_tag {
             fn into_anytag(&self) -> AnyTag<'_> {
                 self.into()
             }
+            fn into_any(&self) -> &dyn std::any::Any {
+                self
+            }
         }
 
         impl AudioTag for $tag {}
 
-        impl From<$tag> for $inner {
-            fn from(inp: $tag) -> Self {
-                inp.inner
+        impl From<&$tag> for $inner {
+            fn from(inp: &$tag) -> Self {
+                inp.inner.clone()
             }
         }
 

src/traits.rs

@@ -148,4 +148,5 @@ pub trait IntoAnyTag {
             TagType::Flac => Box::new(FlacTag::from(self.into_anytag())),
         }
     }
+    fn into_any(&self) -> &dyn std::any::Any;
 }

tests/inner.rs

@@ -12,4 +12,23 @@ fn test_inner() {
 
     let id3tag_reload = Tag::default().read_from_path("assets/a.mp3").unwrap();
     assert_eq!(id3tag_reload.title(), Some("title from metaflac::Tag"));
+
+    let mut id3tag_inner: id3::Tag = id3tag_reload
+        .into_any()
+        .downcast_ref::<Id3v2Tag>()
+        .unwrap()
+        .into();
+    let timestamp = id3::Timestamp {
+        year: 2013,
+        month: Some(2u8),
+        day: Some(5u8),
+        hour: Some(6u8),
+        minute: None,
+        second: None,
+    };
+    id3tag_inner.set_date_recorded(timestamp.clone());
+    id3tag_inner.write_to_path("assets/a.mp3", id3::Version::Id3v24);
+
+    let id3tag_reload = id3::Tag::read_from_path("assets/a.mp3").unwrap();
+    assert_eq!(id3tag_reload.date_recorded(), Some(timestamp));
 }