Wallet.h

#pragma once
#include <string>
#include <map>
#include "OrderBookEntry.h"

class Wallet
{
    public:
    Wallet();

    friend std::ostream& operator<<(std::ostream& os, Wallet& wallet);

    /** insert currency to the wallet */
    void insertCurrency(std::string type, double amount);
    /** remove currency from the wallet */
    bool removeCurrency(std::string type, double amount);
    /** check if the wallet contains this much currency or more */
    bool containsCurrency(std::string type, double amount);

    /** checks if the wallet can cope with this ask or bid.*/
    bool canFulfillOrder(OrderBookEntry order);
    /** update the contents of the wallet
     * assumes the order was made by the owner of the wallet
     */
    void processSale(OrderBookEntry& sale);
    
    /** generate a string representation of the wallet */
    std::string toString();
    private:
    std::map<std::string,double> currencies;
};