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downcast to wrapper tag

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This commit is contained in:
Tianyi 2020-10-27 23:02:15 +00:00
parent 6e10a0b93d
commit 923d7b1ce8
1 changed files with 8 additions and 8 deletions
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16
audiotags-dev-macro/src/lib.rs
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@ -61,14 +61,14 @@ macro_rules! impl_tag {
// downcasting
// impl std::convert::TryFrom<Box<dyn AudioTag>> for &$tag {
// type Error = crate::Error;
// fn try_from(inp: Box<dyn AudioTag>) -> crate::Result<Self> {
// inp.into_any()
// .downcast_ref::<$tag>()
// .ok_or(crate::Error::DowncastError)
// }
// }
impl<'a> std::convert::TryFrom<&'a Box<dyn AudioTag>> for &'a $tag {
type Error = crate::Error;
fn try_from(inp: &'a Box<dyn AudioTag>) -> crate::Result<Self> {
inp.into_any()
.downcast_ref::<$tag>()
.ok_or(crate::Error::DowncastError)
}
}
impl std::convert::TryFrom<Box<dyn AudioTag>> for $inner {
type Error = crate::Error;