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    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    //! Unique identifiers.

    use util::hash::H256;
    use header::BlockNumber;

    /// Uniquely identifies block.
    #[derive(Debug, PartialEq, Copy, Clone, Hash, Eq)]
    #[cfg_attr(feature = "ipc", binary)]
    pub enum BlockId {
    	/// Block's sha3.
    	/// Querying by hash is always faster.
    	Hash(H256),
    	/// Block number within canon blockchain.
    	Number(BlockNumber),
    	/// Earliest block (genesis).
    	Earliest,
    	/// Latest mined block.
    	Latest,
    	/// Pending block.
    	Pending,
    }

    /// Uniquely identifies transaction.
    #[derive(Debug, PartialEq, Clone, Hash, Eq)]
    #[cfg_attr(feature = "ipc", binary)]
    pub enum TransactionId {
    	/// Transaction's sha3.
    	Hash(H256),
    	/// Block id and transaction index within this block.
    	/// Querying by block position is always faster.
    	Location(BlockId, usize)
    }

    /// Uniquely identifies Trace.
    #[cfg_attr(feature = "ipc", binary)]
    pub struct TraceId {
    	/// Transaction
    	pub transaction: TransactionId,
    	/// Trace address within transaction.
    	pub address: Vec<usize>,
    }

    /// Uniquely identifies Uncle.
    #[derive(Debug, PartialEq, Eq, Copy, Clone)]
    #[cfg_attr(feature = "ipc", binary)]
    pub struct UncleId {
    	/// Block id.
    	pub block: BlockId,
    	/// Position in block.
    	pub position: usize
    }

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