Method replace

src/cpp-ethereum/libethereum/BlockQueue.h:125–137

	}

	bool replace(h256 const& _hash, T&& _t)
	{
		auto const it = std::find_if(m_queue.begin(), m_queue.end(), sha3UnclesEquals(_hash));

		if (it == m_queue.end())
			return false;

		m_size -= it->blockData.size();
		m_size += _t.blockData.size();
		*it = std::move(_t);

		return true;
	}

private:
	static std::function<bool(T const&)> sha3UnclesEquals(h256 const& _hash)