# Trait ethcore_rpc::v1::traits::eth::EthFilter [−]

    pub trait EthFilter: Sized + Send + Sync + 'static {
        fn new_filter(&self, Filter) -> Result<U256, Error>;
        fn new_block_filter(&self) -> Result<U256, Error>;
        fn new_pending_transaction_filter(&self) -> Result<U256, Error>;
        fn filter_changes(&self, Index) -> Result<FilterChanges, Error>;
        fn filter_logs(&self, Index) -> Result<Vec<Log>, Error>;
        fn uninstall_filter(&self, Index) -> Result<bool, Error>;

        fn to_delegate<M: Metadata>(self) -> IoDelegate<Self, M> { ... }
    }

Eth filters rpc api (polling).

## Required Methods

### `fn new_filter(&self, Filter) -> Result<U256, Error>`

Returns id of new filter.

### `fn new_block_filter(&self) -> Result<U256, Error>`

Returns id of new block filter.

### `fn new_pending_transaction_filter(&self) -> Result<U256, Error>`

Returns id of new block filter.

### `fn filter_changes(&self, Index) -> Result<FilterChanges, Error>`

Returns filter changes since last poll.

### `fn filter_logs(&self, Index) -> Result<Vec<Log>, Error>`

Returns all logs matching given filter (in a range 'from' - 'to').

### `fn uninstall_filter(&self, Index) -> Result<bool, Error>`

Uninstalls filter.

## Provided Methods

### `fn to_delegate<M: Metadata>(self) -> IoDelegate<Self, M>`

Transform this into an `IoDelegate`, automatically wrapping the parameters.

## Implementors

- `impl<C, M> EthFilter for EthFilterClient<C, M> where C: BlockChainClient + 'static, M: MinerService + 'static`

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