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use core::borrow::Borrow;
use eosio::{AccountName, ReadError, ScopeName, Table, WriteError};
pub enum Payer {
Same,
New(AccountName),
}
pub trait TableCursor<T>: IntoIterator
where
T: Table,
{
fn get(&self) -> Result<T::Row, ReadError>;
fn erase(&self) -> Result<T::Row, ReadError>;
fn modify<I: Borrow<T::Row>>(
&self,
payer: Payer,
item: I,
) -> Result<usize, WriteError>;
}
pub trait TableIndex<'a, K, T>
where
T: Table + 'a,
{
type Cursor: TableCursor<T> + 'a;
fn code(&'a self) -> AccountName;
fn scope(&'a self) -> ScopeName;
fn lower_bound<N: Into<K>>(&'a self, key: N) -> Option<Self::Cursor>;
fn upper_bound<N: Into<K>>(&'a self, key: N) -> Option<Self::Cursor>;
fn emplace<I: Borrow<T::Row>>(
&'a self,
payer: AccountName,
item: I,
) -> Result<(), WriteError>;
fn find<N: Into<K>>(&'a self, key: N) -> Option<Self::Cursor>;
#[inline]
fn exists<N: Into<K>>(&'a self, key: N) -> bool {
self.find(key).is_some()
}
}
pub trait TableIterator: DoubleEndedIterator {}