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    use std::ops;
    use primitives::hash::H256;
    use chain::{IndexedBlock, IndexedTransaction, IndexedBlockHeader};

    /// Blocks whose parents are known to be in the chain
    #[derive(Clone, Copy)]
    pub struct CanonBlock<'a> {
    	block: &'a IndexedBlock,
    }

    impl<'a> CanonBlock<'a> {
    	pub fn new(block: &'a IndexedBlock) -> Self {
    		CanonBlock {
    			block: block,
    		}
    	}

    	pub fn hash<'b>(&'b self) -> &'a H256 where 'a: 'b {
    		&self.block.header.hash
    	}

    	pub fn raw<'b>(&'b self) -> &'a IndexedBlock where 'a: 'b {
    		self.block
    	}

    	pub fn header<'b>(&'b self) -> CanonHeader<'a> where 'a: 'b {
    		CanonHeader::new(&self.block.header)
    	}

    	pub fn transactions<'b>(&'b self) -> Vec<CanonTransaction<'a>> where 'a: 'b {
    		self.block.transactions.iter().map(CanonTransaction::new).collect()
    	}
    }

    impl<'a> ops::Deref for CanonBlock<'a> {
    	type Target = IndexedBlock;

    	fn deref(&self) -> &Self::Target {
    		self.block
    	}
    }

    #[derive(Clone, Copy)]
    pub struct CanonHeader<'a> {
    	header: &'a IndexedBlockHeader,
    }

    impl<'a> CanonHeader<'a> {
    	pub fn new(header: &'a IndexedBlockHeader) -> Self {
    		CanonHeader {
    			header: header,
    		}
    	}
    }

    impl<'a> ops::Deref for CanonHeader<'a> {
    	type Target = IndexedBlockHeader;

    	fn deref(&self) -> &Self::Target {
    		self.header
    	}
    }

    #[derive(Clone, Copy)]
    pub struct CanonTransaction<'a> {
    	transaction: &'a IndexedTransaction,
    }

    impl<'a> CanonTransaction<'a> {
    	pub fn new(transaction: &'a IndexedTransaction) -> Self {
    		CanonTransaction {
    			transaction: transaction,
    		}
    	}
    }

    impl<'a> ops::Deref for CanonTransaction<'a> {
    	type Target = IndexedTransaction;

    	fn deref(&self) -> &Self::Target {
    		self.transaction
    	}
    }

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