C++ STAmount::exponent方法代码示例

Quality
composed_quality (Quality const& lhs, Quality const& rhs)
{
    STAmount const lhs_rate (lhs.rate ());
    assert (lhs_rate != zero);

    STAmount const rhs_rate (rhs.rate ());
    assert (rhs_rate != zero);

    STAmount const rate (mulRound (
        lhs_rate, rhs_rate, lhs_rate.issue (), true));

    std::uint64_t const stored_exponent (rate.exponent () + 100);
    std::uint64_t const stored_mantissa (rate.mantissa());

    assert ((stored_exponent > 0) && (stored_exponent <= 255));

    return Quality ((stored_exponent << (64 - 8)) | stored_mantissa);
}

    TER preCheck () override
    {
        std::uint32_t const uTxFlags = mTxn.getFlags ();

        if (uTxFlags & tfPaymentMask)
        {
            m_journal.trace << "Malformed transaction: " <<
                "Invalid flags set.";
            return temINVALID_FLAG;
        }

        bool const partialPaymentAllowed = uTxFlags & tfPartialPayment;
        bool const limitQuality = uTxFlags & tfLimitQuality;
        bool const defaultPathsAllowed = !(uTxFlags & tfNoDivvyDirect);
        bool const bPaths = mTxn.isFieldPresent (sfPaths);
        bool const bMax = mTxn.isFieldPresent (sfSendMax);

        STAmount const saDstAmount (mTxn.getFieldAmount (sfAmount));

        STAmount maxSourceAmount;

        if (bMax)
            maxSourceAmount = mTxn.getFieldAmount (sfSendMax);
        else if (saDstAmount.native ())
            maxSourceAmount = saDstAmount;
        else
            maxSourceAmount = STAmount (
                { saDstAmount.getCurrency (), mTxnAccountID },
                saDstAmount.mantissa(), saDstAmount.exponent (),
                saDstAmount < zero);

        auto const& uSrcCurrency = maxSourceAmount.getCurrency ();
        auto const& uDstCurrency = saDstAmount.getCurrency ();

        // isZero() is XDV.  FIX!
        bool const bXDVDirect = uSrcCurrency.isZero () && uDstCurrency.isZero ();

        if (!isLegalNet (saDstAmount) || !isLegalNet (maxSourceAmount))
            return temBAD_AMOUNT;

        AccountID const uDstAccountID (mTxn.getFieldAccount160 (sfDestination));

        if (!uDstAccountID)
        {
            m_journal.trace << "Malformed transaction: " <<
                "Payment destination account not specified.";
            return temDST_NEEDED;
        }
        if (bMax && maxSourceAmount <= zero)
        {
            m_journal.trace << "Malformed transaction: " <<
                "bad max amount: " << maxSourceAmount.getFullText ();
            return temBAD_AMOUNT;
        }
        if (saDstAmount <= zero)
        {
            m_journal.trace << "Malformed transaction: "<<
                "bad dst amount: " << saDstAmount.getFullText ();
            return temBAD_AMOUNT;
        }
        if (badCurrency() == uSrcCurrency || badCurrency() == uDstCurrency)
        {
            m_journal.trace <<"Malformed transaction: " <<
                "Bad currency.";
            return temBAD_CURRENCY;
        }
        if (mTxnAccountID == uDstAccountID && uSrcCurrency == uDstCurrency && !bPaths)
        {
            // You're signing yourself a payment.
            // If bPaths is true, you might be trying some arbitrage.
            m_journal.trace << "Malformed transaction: " <<
                "Redundant payment from " << to_string (mTxnAccountID) <<
                " to self without path for " << to_string (uDstCurrency);
            return temREDUNDANT;
        }
        if (bXDVDirect && bMax)
        {
            // Consistent but redundant transaction.
            m_journal.trace << "Malformed transaction: " <<
                "SendMax specified for XDV to XDV.";
            return temBAD_SEND_XDV_MAX;
        }
        if (bXDVDirect && bPaths)
        {
            // XDV is sent without paths.
            m_journal.trace << "Malformed transaction: " <<
                "Paths specified for XDV to XDV.";
            return temBAD_SEND_XDV_PATHS;
        }
        if (bXDVDirect && partialPaymentAllowed)
        {
            // Consistent but redundant transaction.
            m_journal.trace << "Malformed transaction: " <<
                "Partial payment specified for XDV to XDV.";
            return temBAD_SEND_XDV_PARTIAL;
        }
        if (bXDVDirect && limitQuality)
        {
            // Consistent but redundant transaction.
            m_journal.trace << "Malformed transaction: " <<
//.........这里部分代码省略.........

    TER doApply () override
    {
        // Divvy if source or destination is non-native or if there are paths.
        std::uint32_t const uTxFlags = mTxn.getFlags ();
        bool const partialPaymentAllowed = uTxFlags & tfPartialPayment;
        bool const limitQuality = uTxFlags & tfLimitQuality;
        bool const defaultPathsAllowed = !(uTxFlags & tfNoDivvyDirect);
        bool const bPaths = mTxn.isFieldPresent (sfPaths);
        bool const bMax = mTxn.isFieldPresent (sfSendMax);
        AccountID const uDstAccountID (mTxn.getFieldAccount160 (sfDestination));
        STAmount const saDstAmount (mTxn.getFieldAmount (sfAmount));
        STAmount maxSourceAmount;
        if (bMax)
            maxSourceAmount = mTxn.getFieldAmount (sfSendMax);
        else if (saDstAmount.native ())
            maxSourceAmount = saDstAmount;
        else
          maxSourceAmount = STAmount (
              {saDstAmount.getCurrency (), mTxnAccountID},
              saDstAmount.mantissa(), saDstAmount.exponent (),
              saDstAmount < zero);

        m_journal.trace <<
            "maxSourceAmount=" << maxSourceAmount.getFullText () <<
            " saDstAmount=" << saDstAmount.getFullText ();

        // Open a ledger for editing.
        auto const index = getAccountRootIndex (uDstAccountID);
        SLE::pointer sleDst (mEngine->view().entryCache (ltACCOUNT_ROOT, index));

        if (!sleDst)
        {
            // Destination account does not exist.
            if (!saDstAmount.native ())
            {
                m_journal.trace <<
                    "Delay transaction: Destination account does not exist.";

                // Another transaction could create the account and then this
                // transaction would succeed.
                return tecNO_DST;
            }
            else if (mParams & tapOPEN_LEDGER && partialPaymentAllowed)
            {
                // You cannot fund an account with a partial payment.
                // Make retry work smaller, by rejecting this.
                m_journal.trace <<
                    "Delay transaction: Partial payment not allowed to create account.";


                // Another transaction could create the account and then this
                // transaction would succeed.
                return telNO_DST_PARTIAL;
            }
            else if (saDstAmount < STAmount (mEngine->getLedger ()->getReserve (0)))
            {
                // getReserve() is the minimum amount that an account can have.
                // Reserve is not scaled by load.
                m_journal.trace <<
                    "Delay transaction: Destination account does not exist. " <<
                    "Insufficent payment to create account.";

                // TODO: dedupe
                // Another transaction could create the account and then this
                // transaction would succeed.
                return tecNO_DST_INSUF_XDV;
            }

            // Create the account.
            sleDst = std::make_shared<SLE>(ltACCOUNT_ROOT,
                getAccountRootIndex (uDstAccountID));
            sleDst->setFieldAccount (sfAccount, uDstAccountID);
            sleDst->setFieldU32 (sfSequence, 1);
            mEngine->view().entryCreate(sleDst);
        }
        else if ((sleDst->getFlags () & lsfRequireDestTag) &&
                 !mTxn.isFieldPresent (sfDestinationTag))
        {
            // The tag is basically account-specific information we don't
            // understand, but we can require someone to fill it in.

            // We didn't make this test for a newly-formed account because there's
            // no way for this field to be set.
            m_journal.trace << "Malformed transaction: DestinationTag required.";

            return tecDST_TAG_NEEDED;
        }
        else
        {
            // Tell the engine that we are intending to change the the destination
            // account.  The source account gets always charged a fee so it's always
            // marked as modified.
            mEngine->view().entryModify (sleDst);
        }

        TER terResult;

        bool const bDivvy = bPaths || bMax || !saDstAmount.native ();
        // XXX Should bMax be sufficient to imply divvy?

//.........这里部分代码省略.........

    TER doApply () override
    {
        // Ripple if source or destination is non-native or if there are paths.
        std::uint32_t const uTxFlags = mTxn.getFlags ();
        bool const partialPaymentAllowed = uTxFlags & tfPartialPayment;
        bool const limitQuality = uTxFlags & tfLimitQuality;
        bool const defaultPathsAllowed = !(uTxFlags & tfNoRippleDirect);
        bool const bPaths = mTxn.isFieldPresent (sfPaths);
        bool const bMax = mTxn.isFieldPresent (sfSendMax);
        Account const uDstAccountID (mTxn.getFieldAccount160 (sfDestination));
        STAmount const saDstAmount (mTxn.getFieldAmount (sfAmount));
        STAmount maxSourceAmount;
        if (bMax)
            maxSourceAmount = mTxn.getFieldAmount (sfSendMax);
        else if (saDstAmount.isNative ())
            maxSourceAmount = saDstAmount;
        else
          maxSourceAmount = STAmount (
              {saDstAmount.getCurrency (), mTxnAccountID},
              saDstAmount.mantissa(), saDstAmount.exponent (),
              saDstAmount < zero);
        auto const& uSrcCurrency = maxSourceAmount.getCurrency ();
        auto const& uDstCurrency = saDstAmount.getCurrency ();

        // isZero() is XRP.  FIX!
        bool const bXRPDirect = uSrcCurrency.isZero () && uDstCurrency.isZero ();

        m_journal.trace <<
            "maxSourceAmount=" << maxSourceAmount.getFullText () <<
            " saDstAmount=" << saDstAmount.getFullText ();

        if (!isLegalNet (saDstAmount) || !isLegalNet (maxSourceAmount))
            return temBAD_AMOUNT;

        if (uTxFlags & tfPaymentMask)
        {
            m_journal.trace <<
                "Malformed transaction: Invalid flags set.";

            return temINVALID_FLAG;
        }
        else if (!uDstAccountID)
        {
            m_journal.trace <<
                "Malformed transaction: Payment destination account not specified.";

            return temDST_NEEDED;
        }
        else if (bMax && maxSourceAmount <= zero)
        {
            m_journal.trace <<
                "Malformed transaction: bad max amount: " << maxSourceAmount.getFullText ();

            return temBAD_AMOUNT;
        }
        else if (saDstAmount <= zero)
        {
            m_journal.trace <<
                "Malformed transaction: bad dst amount: " << saDstAmount.getFullText ();

            return temBAD_AMOUNT;
        }
        else if (badCurrency() == uSrcCurrency || badCurrency() == uDstCurrency)
        {
            m_journal.trace <<
                "Malformed transaction: Bad currency.";

            return temBAD_CURRENCY;
        }
        else if (mTxnAccountID == uDstAccountID && uSrcCurrency == uDstCurrency && !bPaths)
        {
            // You're signing yourself a payment.
            // If bPaths is true, you might be trying some arbitrage.
            m_journal.trace <<
                "Malformed transaction: Redundant transaction:" <<
                " src=" << to_string (mTxnAccountID) <<
                " dst=" << to_string (uDstAccountID) <<
                " src_cur=" << to_string (uSrcCurrency) <<
                " dst_cur=" << to_string (uDstCurrency);

            return temREDUNDANT;
        }
        else if (bMax && maxSourceAmount == saDstAmount &&
                 maxSourceAmount.getCurrency () == saDstAmount.getCurrency ())
        {
            // Consistent but redundant transaction.
            m_journal.trace <<
                "Malformed transaction: Redundant SendMax.";

            return temREDUNDANT_SEND_MAX;
        }
        else if (bXRPDirect && bMax)
        {
            // Consistent but redundant transaction.
            m_journal.trace <<
                "Malformed transaction: SendMax specified for XRP to XRP.";

            return temBAD_SEND_XRP_MAX;
        }
        else if (bXRPDirect && bPaths)
//.........这里部分代码省略.........