time_point.h

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#pragma once
#ifndef SYDEVS_TIME_POINT_H_
#define SYDEVS_TIME_POINT_H_

#include <sydevs/core/quantity.h>
#include <stdexcept>
#include <vector>

namespace sydevs {


class time_point
{
public:
    time_point();

    explicit time_point(duration dt);

    time_point(const time_point&)            = default;  
    time_point& operator=(const time_point&) = default;  
    time_point(time_point&&)                 = default;  
    time_point& operator=(time_point&&)      = default;  
    ~time_point()                            = default;  

    int64 sign() const;       
    scale precision() const;  
    int64 nscales() const;    

    int64 scale_digit(scale precision) const;  
    int64 scale_phase(scale precision) const;  
    int64 epoch_phase(scale precision) const;  

    time_point& advance(duration rhs);

    time_point& operator+=(duration rhs);  
    time_point& operator-=(duration rhs);  

    const time_point operator+(duration rhs) const;  
    const time_point operator-(duration rhs) const;  

    const duration operator-(const time_point& rhs) const;

    duration gap(const time_point& rhs) const;

    bool operator==(const time_point& rhs) const;  
    bool operator!=(const time_point& rhs) const;  
    bool operator<(const time_point& rhs) const;   
    bool operator>(const time_point& rhs) const;   
    bool operator<=(const time_point& rhs) const;  
    bool operator>=(const time_point& rhs) const;  

    bool operator==(duration rhs) const;  
    bool operator!=(duration rhs) const;  
    bool operator<(duration rhs) const;   
    bool operator>(duration rhs) const;   
    bool operator<=(duration rhs) const;  
    bool operator>=(duration rhs) const;  

private:
    scale upper_discrepant_precision(const time_point& rhs) const;

    int8 sign_;
    scale precision_;
    std::vector<int16> digits_;
};


std::ostream& operator<<(std::ostream& os, const time_point& rhs);
    
    
bool operator==(duration lhs, const time_point& rhs);
bool operator!=(duration lhs, const time_point& rhs);
bool operator<(duration lhs, const time_point& rhs);
bool operator>(duration lhs, const time_point& rhs);
bool operator<=(duration lhs, const time_point& rhs);
bool operator>=(duration lhs, const time_point& rhs);


inline int64 time_point::sign() const
{
    return sign_;
}


inline scale time_point::precision() const
{
    return precision_;
}


inline int64 time_point::nscales() const
{
    return digits_.size();
}


}  // namespace

#endif