date.h

#ifndef TOURNAMENT_RUNNER_DATE_H_
#define TOURNAMENT_RUNNER_DATE_H_

#include <cstdint>
#include <ostream>

#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/split_member.hpp>

using boost::serialization::make_nvp;

namespace TournamentRunner
{

class Date
{
public:
    Date () = default;
    explicit Date (const std::string& date_as_string);

    explicit Date (boost::gregorian::date date);

    bool is_valid () const;
    std::string to_iso_extended_string () const;

    int32_t year () const;
    int32_t month () const;
    int32_t day () const;

    Date& operator= (const Date&) = default;
    Date (const Date&) = default;

private:
    static boost::gregorian::date date_from_string (const std::string& date_as_string);

    friend class boost::serialization::access;

    friend bool operator==(const Date&, const Date&);

    template<class Archive>
    void save (Archive& archive,
               const unsigned int version) const;

    template<class Archive>
    void load (Archive& archive,
               const unsigned int version);

    BOOST_SERIALIZATION_SPLIT_MEMBER()

    boost::gregorian::date date_{boost::gregorian::day_clock::local_day()};
};

bool operator== (const Date& lhs, const Date& rhs);

bool operator!= (const Date& lhs, const Date& rhs);

std::ostream& operator<<(std::ostream& os,
                         const Date& date);

template<class Archive>
void Date::save (Archive& archive,
                 const unsigned int /*version*/) const
{
    const auto date_as_string = boost::gregorian::to_iso_extended_string(date_);
    archive & make_nvp("Date", date_as_string);
}

template<class Archive>
void Date::load (Archive& archive,
                 const unsigned int /*version*/)
{
    auto date_as_string = std::string{};
    archive & make_nvp("Date", date_as_string);
    date_ = boost::gregorian::from_simple_string(date_as_string);
}

} // namespace TournamentRunner

#endif //TOURNAMENT_RUNNER_DATE_H_