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12 changes: 12 additions & 0 deletions library/core/src/cmp.rs
Original file line number Diff line number Diff line change
Expand Up @@ -568,6 +568,18 @@ impl Ordering {
}
}

#[stable(feature = "convert_ordering_into_i32", since = "1.57.0")]
impl From<Ordering> for i32 {
/// Convert an [`Ordering`] into a signed 32-bit integer.
///
/// This function converts an `Ordering` into an integer compatible with C
/// FFI. This `i32` value is compatible with the return value of C library
/// functions such as `strncmp`.
fn from(ordering: Ordering) -> Self {
ordering as i32
}
}

/// A helper struct for reverse ordering.
///
/// This struct is a helper to be used with functions like [`Vec::sort_by_key`] and
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