Wallet.h

#pragma once
#include <ctime>
#include <cmath>
#include <string>
 
namespace Chiffres {
    class Wallet {
    public:
        Wallet(std::string owner, double balance);

        [[nodiscard]] double getBalance() const;

        void deposit(double amount);

        bool withdraw(double amount);
 
    private:
        void update_balance_to_now();

        static constexpr double DECAY_RATE = 0.000008;
        double m_balance;
        std::string m_owner;
        time_t m_last_activity_timestamp;
    };
}