use crate::errors::StdError;
use std::convert::TryFrom;
/// KV is a Key-Value pair, returned from our iterators
pub type KV<T = Vec<u8>> = (Vec<u8>, T);
#[derive(Copy, Clone)]
// We assign these to integers to provide a stable API for passing over FFI (to wasm and Go)
pub enum Order {
Ascending = 1,
Descending = 2,
}
impl TryFrom<i32> for Order {
type Error = StdError;
fn try_from(value: i32) -> Result<Self, Self::Error> {
match value {
1 => Ok(Order::Ascending),
2 => Ok(Order::Descending),
_ => Err(StdError::generic_err("Order must be 1 or 2")),
}
}
}
impl Into<i32> for Order {
fn into(self) -> i32 {
self as i32
}
}