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Seal the RowIndex trait (technically breaking, but unlikely to break anybody)

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This commit is contained in:
Thom Chiovoloni 2020-11-02 19:28:50 -08:00
parent b9ccb252ef
commit c45446ba73
1 changed files with 11 additions and 1 deletions
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12
src/row.rs
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@ -346,8 +346,18 @@ impl<'stmt> Row<'stmt> {
} }
} }
mod sealed {
/// This trait exists just to ensure that the only impls of `trait Params`
/// that are allowed are ones in this crate.
pub trait Sealed {}
impl Sealed for usize {}
impl Sealed for &str {}
}
/// A trait implemented by types that can index into columns of a row. /// A trait implemented by types that can index into columns of a row.
pub trait RowIndex { ///
/// It is only implemented for `usize` and `&str`.
pub trait RowIndex: sealed::Sealed {
/// Returns the index of the appropriate column, or `None` if no such /// Returns the index of the appropriate column, or `None` if no such
/// column exists. /// column exists.
fn idx(&self, stmt: &Statement<'_>) -> Result<usize>; fn idx(&self, stmt: &Statement<'_>) -> Result<usize>;