65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
#include <iostream>
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#include <string>
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#include <vector>
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#include <OrderBookEntry.h>
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double computeAveragePrice(std::vector<OrderBookEntry>& entries)
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{
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double avg = 0;
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for(unsigned int i=0; i<entries.size(); ++i) //thid doesn't create a copy, ++i increments on the same variable
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{
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//std::cout << "The price is " << entries[i].price << std::endl;
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avg += entries[i].price;
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}
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return avg/entries.size();
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}
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int main()
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{
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std::vector<OrderBookEntry> orders;
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orders.push_back( OrderBookEntry{
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10000,
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0.002,
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"2020/03/17 17:01:24.884492",
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"BTC/USDT",
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OrderBookType::bid});
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orders.push_back( OrderBookEntry{
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50000,
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0.002,
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"2020/03/17 17:01:24.884492",
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"BTC/USDT",
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OrderBookType::bid});
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// Version 1
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std::cout << "Version 1" << std::endl;
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for(OrderBookEntry order : orders) //this create a copy of the members of orders and assigns it to 'order'
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{
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std::cout << "The price is " << order.price << std::endl;
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}
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std::cout << "---new line---" << std::endl;
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for(OrderBookEntry &order : orders) //this doesn't crate a copy
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{
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std::cout << "The price is " << order.price << std::endl;
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}
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// Version 2
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std::cout << "Version 2" << std::endl;
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for(unsigned int i=0; i<orders.size(); ++i) //thid doesn't create a copy, ++i increments on the same variable
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{
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std::cout << "The price is " << orders[i].price << std::endl;
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}
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//version 3
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std::cout << "Version 3" << std::endl;
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for(unsigned int i=0; i<orders.size(); ++i) //thid doesn't create a copy, ++i increments on the same variable
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{
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std::cout << "The price is " << orders.at(i).price << std::endl;
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}
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std::cout << "Average price: " << computeAveragePrice(orders) << std::endl;
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} |