{
        return a.address < b.address;
    }
    bool operator()(const AddressTableEntry &a, const QString &b) const
    {
        return a.address < b;
    }
    bool operator()(const QString &a, const AddressTableEntry &b) const
    {
        return a < b.address;
    }
};

/* Determine address type from address purpose */
static AddressTableEntry::Type translateTransactionType(const QString &strPurpose, bool isMine)
{
    AddressTableEntry::Type addressType = AddressTableEntry::Hidden;
    // "refund" addresses aren't shown, and change addresses aren't in mapAddressBook at all.
    if (strPurpose == "send")
        addressType = AddressTableEntry::Sending;
    else if (strPurpose == "receive")
        addressType = AddressTableEntry