daatabase.cpp

#include "database.h"
using namespace std;

void Database::Add(const Date& _Date, const string& _Event)
{
    const auto it = Records[_Date].first.insert(_Event);
    if (it.second)
    {
        Records[_Date].second.push_back(it.first);
    }
}

void Database::Print(ostream& os) const
{
    for (const auto& [_Key, _Value] : Records)
    {
        for (const auto& _Event : _Value.second)
            os << _Key << ' ' << *_Event << "\n";
    }
}

string Database::Last(const Date& _Date) const
{
    const auto upperIt = Records.upper_bound(_Date);
    if (upperIt == Records.begin())
    {
        return "No entries";
    }

    return prev(upperIt)->first.DateToStr() + ' ' + *prev(upperIt)->second.second.back();
}