Time.h

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/*
 * Copyright Onix Solutions Limited [OnixS]. All rights reserved.
 *
 * This software owned by Onix Solutions Limited [OnixS] and is protected by copyright law
 * and international copyright treaties.
 *
 * Access to and use of the software is governed by the terms of the applicable ONIXS Software
 * Services Agreement (the Agreement) and Customer end user license agreements granting
 * a non-assignable, non-transferable and non-exclusive license to use the software
 * for it's own data processing purposes under the terms defined in the Agreement.
 *
 * Except as otherwise granted within the terms of the Agreement, copying or reproduction of any
 * part of this source code or associated reference material to any other location for further
 * reproduction or redistribution, and any amendments to this copyright notice, are expressly
 * prohibited.
 *
 * Any reproduction or redistribution for sale or hiring of the Software not in accordance with
 * the terms of the Agreement is a violation of copyright law.
 */

#pragma once

#if defined(__linux__)
#  include <sys/time.h>
#  include <unistd.h>
#endif

#include "OnixS/Eurex/Trading/Defines.h"
#include "OnixS/Eurex/Trading/Export.h"

#include <iosfwd>
#include <string>

namespace OnixS { namespace Eurex { namespace Trading {

#if defined(_WIN32)

typedef unsigned __int64 AbsoluteHighResolutionTimeImpl;

typedef __int64 RelativeHighResolutionTimeImpl;

#elif defined(__linux__)

typedef timeval AbsoluteHighResolutionTimeImpl;

typedef struct Nothing
{
} RelativeHighResolutionTimeImpl;
#else

#  error High resolution time services are not defined for a given platform.

#endif
/// Alias for raw timestamps.
typedef AbsoluteHighResolutionTimeImpl Timestamp;

/// Fields of HighResolutionTime.
struct ONIXS_EUREX_ETI_EXPORT HighResolutionTimeFields
{
    unsigned short year;
    unsigned short month;
    unsigned short day;

    unsigned short hour;
    unsigned short minute;
    unsigned short seconds;

    unsigned int microseconds;

    /// Default constructor.
    HighResolutionTimeFields();

    /// From absolute.
    void fromAbsolute(const AbsoluteHighResolutionTimeImpl&);

    /// To absolute.
    void toAbsolute(AbsoluteHighResolutionTimeImpl*) const;

    /// Parse from string.
    void fromString(const std::string&);

    /// Returns string representation.
    std::string toString() const;
};

typedef long long HighResolutionTimeSpan;

/// Miscellaneous time traits.
class ONIXS_EUREX_ETI_EXPORT HighResolutionTime
{
public:
    /// Initializes as not valid.
    HighResolutionTime();

    /// Initializes from given number of milliseconds since Jan 1st, 1970, 00:00:00 GMT.
    HighResolutionTime(UInt64);

    /// Initializes from the given set of time attributes.
    HighResolutionTime(const HighResolutionTimeFields&);

    /// Initializes from the other instance.
    HighResolutionTime(const HighResolutionTime&);

    /// Indicates whether the instance is valid time.
    bool isValid() const;

    /// Extracts details like year, month, seconds, etc.
    void getFields(HighResolutionTimeFields* fields) const;

    /// Returns canonical presentation of time.
    std::string toString() const;

    /// Updates to current time.
    void setToNow();

    /// Compares two timestamps for equality.
    bool operator==(const HighResolutionTime&) const;

    /// Compares two timestamps for inequality.
    bool operator!=(const HighResolutionTime&) const;

    /// Returns difference between two times in microseconds.
    HighResolutionTimeSpan operator-(const HighResolutionTime&) const;

    /// Reinitializes from the other instance.
    HighResolutionTime& operator=(const HighResolutionTime&);

    /// Returns current time.
    static HighResolutionTime now();

    /// Returns time from its string presentation.
    static HighResolutionTime parse(const std::string& time);

protected:
    friend struct TimestampHelpers;
#if defined(_WIN32)
    /// Returns time created from relative value.
    static HighResolutionTime createFromRelative(RelativeHighResolutionTimeImpl value);
#elif defined(__linux__)
    /// Returns time created from absolute value.
    static HighResolutionTime createFromAbsolute(AbsoluteHighResolutionTimeImpl value);
#endif

private:
    enum ValueKind
    {
        Invalid,
        Absolute,
        Relative
    };

    union Value
    {
        AbsoluteHighResolutionTimeImpl asAbsolute;
        RelativeHighResolutionTimeImpl asRelative;
    };

    Value value_;
    ValueKind kind_;

    HighResolutionTime(ValueKind kind);
};

inline bool HighResolutionTime::isValid() const
{
    return !(Invalid == kind_);
}

ONIXS_EUREX_ETI_EXPORT std::ostream& operator<<(std::ostream&, const HighResolutionTime&);

}}} // namespace OnixS::Eurex::Trading