C++ price函数代码示例

 market_history_record(price highest_bid = price(),
                       price lowest_ask = price(),
                       share_type volume = 0,
                       fc::optional<price> recent_average_price = fc::optional<price>())
   : highest_bid(highest_bid),
     lowest_ask(lowest_ask),
     volume(volume),
     recent_average_price(recent_average_price)
 {}

 market_history_record(price highest_bid = price(),
                       price lowest_ask = price(),
                       price opening_price = price(),
                       price closing_price = price(),
                       share_type volume = 0)
   : highest_bid(highest_bid),
     lowest_ask(lowest_ask),
     opening_price(opening_price),
     closing_price(closing_price),
     volume(volume)
 {}

int StaticHashTableBuilder::calcBestModulus (){
	int bestPrice  = price (1);
	int bestMod    = 1;
	for (size_t i = 2; i < 3 * mHashes.size(); i++){
		int p = price (i);
		if (p < bestPrice){
			bestPrice = p;
			bestMod   = i;
		}
	}
	return bestMod;
}

int main(int argc, char **argv) {
  parse_args(argc, argv);

  float res = price(n);
  printf("Price is: %f\n", res);

  for (int i = 0; i < runs; i++) {
    start_run();
    res = price(n);
    end_run();
    printf("Price is: %f\n", res);
  }
}

void KEquityPriceUpdateDlg::storePrices()
{
  // update the new prices into the equities

  MyMoneyFile* file = MyMoneyFile::instance();
  QList<MyMoneySecurity> equities = file->securityList();

  QTreeWidgetItem* item = 0;
  MyMoneyFileTransaction ft;
  QString name;

  try {
    for (int i = 0; i < lvEquityList->invisibleRootItem()->childCount(); ++i) {
      item = lvEquityList->invisibleRootItem()->child(i);
      // turn on signals before we modify the last entry in the list
      MyMoneyFile::instance()->blockSignals(i < lvEquityList->invisibleRootItem()->childCount() - 1);

      MyMoneyMoney rate(item->text(PRICE_COL));
      if (!rate.isZero()) {
        QString id = item->text(ID_COL).toUtf8();

        // if the ID has a space, then this is TWO ID's, so it's a currency quote
        if (QString(id).contains(" ")) {
          QStringList ids = id.split(' ', QString::SkipEmptyParts);
          QString fromid = ids[0].toUtf8();
          QString toid = ids[1].toUtf8();
          name = QString("%1 --> %2").arg(fromid).arg(toid);
          MyMoneyPrice price(fromid, toid, QDate().fromString(item->text(DATE_COL), Qt::ISODate), rate, item->text(SOURCE_COL));
          file->addPrice(price);
        } else
          // otherwise, it's a security quote
        {
          MyMoneySecurity security = MyMoneyFile::instance()->security(id);
          name = security.name();
          MyMoneyPrice price(id, security.tradingCurrency(), QDate().fromString(item->text(DATE_COL), Qt::ISODate), rate, item->text(SOURCE_COL));

          // TODO (Ace) Better handling of the case where there is already a price
          // for this date.  Currently, it just overrides the old value.  Really it
          // should check to see if the price is the same and prompt the user.
          MyMoneyFile::instance()->addPrice(price);
        }

      }
    }
    ft.commit();

  } catch (const MyMoneyException &) {
    qDebug("Unable to add price information for %s", qPrintable(name));
  }
}

double MUPD::calc_mu_per_d(
        const SharedMember<Consumer::Differentiable> &con,
        Member::Lock &lock,
        id_t mkt_id,
        const allocation &alloc,
        const Bundle &b) const {

    if (mkt_id == 0)
        return con->d(b, money);

    auto sim = simulation();
    auto mkt = sim->market(mkt_id);
    lock.add(mkt);

    double mu = 0.0;
    // Add together all of the marginal utilities weighted by the output level, since the market may
    // produce more than one good, and quantities may not equal 1.
    for (auto g : mkt->output_unit)
        mu += g.second * con->d(b, g.first);

    double q = alloc.quantity.count(mkt_id) ? alloc.quantity.at(mkt_id) : 0;
    auto pricing = mkt->price(q);

    lock.remove(mkt);

    if (!pricing.feasible) {
        throw market_exhausted_error(mkt_id);
    }

    return mu / pricing.marginal * price_ratio(mkt);
}

int main()
{
  typedef float T;
  double t(0),v(0);
  {
    std::vector<T> price     (128000);
    std::vector<T> strike    (128000);
    std::vector<T> rate      (128000);
    std::vector<T> time      (128000);
    std::vector<T> volatility(128000);
    std::vector<T> call      (128000);
    std::vector<T> put       (128000);

    std::fill(price.begin(),price.end(),1.);
    std::fill(strike.begin(),strike.end(),1.);
    std::fill(rate.begin(),rate.end(),1.);
    std::fill(time.begin(),time.end(),1.);
    std::fill(volatility.begin(),volatility.end(),1.);

    std::cout << "std::vector\n";
    for(int k=0;k<100;++k)
    {
      nt2::tic();
      for(std::size_t i=0;i<price.size();++i)
      blackscholes( price[i], strike[i] , rate[i] , time[i] , volatility[i]
                  , call[i] , put[i]
                  );
      t += nt2::toc(false);
    }
    std::cout << t/100 << "\n";
  }

  v = call();
  std::cout << "Speed-up: " << t/v << "\n";
}

function run()
{
	vars Price = series(price());
	vars Trend = series(LowPass(Price,1000));
	
	Stop = 100*PIP;
	TakeProfit = 100*PIP;
	if(valley(Trend)) {
		//plotPriceProfile(50,0);
		enterLong();
	} else if(peak(Trend)) {
		//plotPriceProfile(50,PMINUS);
		enterShort();
	}

	PlotWidth = 1000;
	PlotHeight1 = 320;
	PlotScale = 4;
	
	//plotDay(Equity,PDIFF); 
	//plotWeek(Equity,PDIFF); 
	//plotMonth(Equity,PDIFF); 
	//plotYear(Equity,PDIFF); 
	plotTradeProfile(50);
}

void MainWindow::populateStore()
{

    int row = 0;
    int i = 0;
    for(auto item : store) {
        QString name(item.first.c_str());
        QString price(QString::number(item.second));
        QPushButton *button = new QPushButton(name);
        QLabel *label = new QLabel("$"+price);
        button->setObjectName(name);
        label->setObjectName(price);
        shopSignalMapper->setMapping(button, name);
        connect(button, SIGNAL(clicked()), shopSignalMapper, SLOT(map()));
        label->setAlignment(Qt::AlignCenter);
        ui->shopLayout->addWidget(button, row, i, Qt::AlignCenter);
        ui->shopLayout->addWidget(label, row+1, i, Qt::AlignCenter);
        QSize widgetSize(50, 50);
        button->setFixedSize(widgetSize);
        label->setFixedSize(widgetSize);
        i++;
        if(i == 9) {
            i = 0;
            row += 2;
        }
    }
}

function run()
{
	BarPeriod = 240;	// 4 hour bars
	
// calculate the buy/sell signal
	vars Price = series(price());
	vars DomPeriod = series(DominantPeriod(Price,30));
	var LowPeriod = LowPass(DomPeriod,500);
	vars HP = series(HighPass(Price,LowPeriod));
	vars Signal = series(Fisher(HP,500));
	var Threshold = 1.0;

// buy and sell
	Stop = 4*ATR(100);
	Trail = 4*ATR(100);
	if(crossUnder(Signal,-Threshold))
		enterLong(); 
	else if(crossOver(Signal,Threshold))
		enterShort();

// plot signals and thresholds
	plot("DominantPeriod",LowPeriod,NEW,BLUE);
	plot("Signal",Signal[0],NEW,RED);
	plot("Threshold1",Threshold,0,BLACK);
	plot("Threshold2",-Threshold,0,BLACK);
	PlotWidth = 600;
	PlotHeight1 = 300;
} 

void Contract::GetContractRow( PyPackedRow* into )
{
    into->SetField( "contractID",			new PyInt(		contractID() ) );
    into->SetField( "issuerID",				new PyInt(		issuerID() ) );
    into->SetField( "issuerCorpID",			new PyInt(		issuerCorpID() ) );
    into->SetField( "type",					new PyInt(		type() ) );
    into->SetField( "availability",			new PyInt(		avail() ) );
    into->SetField( "assigneeID",			new PyInt(		assigneeID() ) );
    into->SetField( "numDays",				new PyInt(		0 ) );
    into->SetField( "startStationID",		new PyInt(		startStationID() ) );
    into->SetField( "endStationID",			new PyInt(		endStationID() ) );
    into->SetField( "startSolarSystemID",   new PyInt(		startSolarSystemID() ) );
    into->SetField( "endSolarSystemID",		new PyInt(		endSolarSystemID() ) );
    into->SetField( "startRegionID",		new PyInt(		startRegionID() ) );
    into->SetField( "endRegionID",			new PyInt(		endRegionID() ) );
    into->SetField( "price",				new PyFloat(	price() ) );
    into->SetField( "reward",				new PyFloat(	reward() ) );
    into->SetField( "collateral",			new PyFloat(	collateral() ) );
    into->SetField( "title",				new PyWString(	title().c_str(), title().length() ) );
    into->SetField( "description",			new PyWString(	description().c_str(), description().length() ) );
    into->SetField( "forCorp",				new PyBool(		forCorp() ) );
    into->SetField( "status",				new PyInt(		status() ) );
    into->SetField( "acceptorID",			new PyInt(		acceptorID() ) );
    into->SetField( "dateIssued",			new PyLong(		dateIssued() ) );
    into->SetField( "dateExpired",			new PyLong(		dateExpired() ) );
    into->SetField( "dateAccepted",			new PyLong(		dateAccepted() ) );
    into->SetField( "dateCompleted",		new PyLong(		dateCompleted() ) );
    into->SetField( "volume",				new PyFloat(	volume() ) );
    into->SetField( "issuerAllianceID",		new PyInt(		issuerAllianceID() ) );
    into->SetField( "issuerWalletKey",		new PyInt(		issuerWalletKey() ) );
    into->SetField( "acceptorWalletKey",	new PyInt(		0 ) );
    into->SetField( "crateID",				new PyInt(		0 ) );
}

 // Copy Constructor
 Good::Good(const Good& other) {
   upc(other._upc);
   name(other._name);
   price(other._price);
   qtyNeeded(other._qtyNeeded);
   taxed(other._taxed);
   quantity(other._quantity);
 }

int main(void){
	int rep = 0;
	for (scanf("%d", &rep); rep > 0; --rep){
		double x;
		scanf("%lf", &x);
		printf("f(%.2lf) = %.2lf\n", x, price(x));
	}
	return 0;
}

void makePrice(const QString& _currencyid, const QDate& _date, const MyMoneyMoney& _price )
{
  MyMoneyFileTransaction ft;
  MyMoneyFile* file = MyMoneyFile::instance();
  MyMoneySecurity curr = file->currency(_currencyid);
  MyMoneyPrice price(_currencyid, file->baseCurrency().id(), _date, _price, "test");
  file->addPrice(price);
  ft.commit();
}

  // operator=
   Item& Item::operator=(const Item& RO){
      upc(RO._upc);
      name(RO._name);
      price(RO._price);
      quantity(RO._quantity);
      taxed(RO._taxed);
      qtyNeeded(RO._qtyNeeded);

      return *this;
   }