Program Listing for File Time_t.h

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// Copyright 2019 Proyectos y Sistemas de Mantenimiento SL (eProsima).
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef _FASTDDS_RTPS_TIME_T_H_
#define _FASTDDS_RTPS_TIME_T_H_

#include <fastrtps/fastrtps_dll.h>

#include <cmath>
#include <cstdint>
#include <iostream>

namespace eprosima {
namespace fastrtps {

struct RTPS_DllAPI Time_t
{
    static constexpr int32_t INFINITE_SECONDS = 0x7fffffff;
    static constexpr uint32_t INFINITE_NANOSECONDS = 0xffffffffu;

    int32_t seconds;
    uint32_t nanosec;

    Time_t();

    Time_t(
            int32_t sec,
            uint32_t nsec);

    Time_t(
            long double sec);

    void fraction(
            uint32_t frac);

    uint32_t fraction() const;

    int64_t to_ns() const;

    inline bool is_infinite() const noexcept
    {
        return is_infinite(*this);
    }

    static void now(
            Time_t& ret);

    static inline constexpr bool is_infinite(
            const Time_t& t) noexcept
    {
        return (INFINITE_SECONDS == t.seconds) || (INFINITE_NANOSECONDS == t.nanosec);
    }

};

using Duration_t = Time_t;

namespace rtps {

class RTPS_DllAPI Time_t
{
public:

    Time_t() = default;

    Time_t(
            int32_t sec,
            uint32_t frac);

    Time_t(
            long double sec);

    Time_t(
            const eprosima::fastrtps::Time_t& time);

    int64_t to_ns() const;

    void from_ns(
            int64_t nanosecs);

    int32_t seconds() const;

    int32_t& seconds();

    void seconds(
            int32_t sec);

    uint32_t nanosec() const;

    void nanosec(
            uint32_t nanos);

    uint32_t fraction() const;

    void fraction(
            uint32_t frac);

    Duration_t to_duration_t() const;

    void from_duration_t(
            const Duration_t& duration);

    static void now(
            Time_t& ret);

private:

    int32_t seconds_ = 0;

    uint32_t fraction_ = 0;

    uint32_t nanosec_ = 0;

    void set_fraction(
            uint32_t frac);

    void set_nanosec(
            uint32_t nanos);
};

#ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

static inline bool operator ==(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() != t2.seconds())
    {
        return false;
    }
    if (t1.fraction() != t2.fraction())
    {
        return false;
    }
    return true;
}

static inline bool operator !=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() != t2.seconds())
    {
        return true;
    }
    if (t1.fraction() != t2.fraction())
    {
        return true;
    }
    return false;
}

static inline bool operator <(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() < t2.seconds())
    {
        return true;
    }
    else if (t1.seconds() > t2.seconds())
    {
        return false;
    }
    else
    {
        if (t1.fraction() < t2.fraction())
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator >(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() > t2.seconds())
    {
        return true;
    }
    else if (t1.seconds() < t2.seconds())
    {
        return false;
    }
    else
    {
        if (t1.fraction() > t2.fraction())
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator <=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() < t2.seconds())
    {
        return true;
    }
    else if (t1.seconds() > t2.seconds())
    {
        return false;
    }
    else
    {
        if (t1.fraction() <= t2.fraction())
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator >=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds() > t2.seconds())
    {
        return true;
    }
    else if (t1.seconds() < t2.seconds())
    {
        return false;
    }
    else
    {
        if (t1.fraction() >= t2.fraction())
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

inline std::ostream& operator <<(
        std::ostream& output,
        const Time_t& t)
{
    return output << t.seconds() << "." << t.nanosec();
}

inline std::istream& operator >>(
        std::istream& input,
        Time_t& t)
{
    std::istream::sentry s(input);

    if (s)
    {
        char point;
        int32_t sec = 0;
        uint32_t nano = 0;
        std::ios_base::iostate excp_mask = input.exceptions();

        try
        {
            input.exceptions(excp_mask | std::ios_base::failbit | std::ios_base::badbit);

            input >> sec;
            input >> point >> nano;
            // nano could not be bigger or equal than 1 sec
            if ( point != '.' || nano >= 1000000000 )
            {
                input.setstate(std::ios_base::failbit);
                nano = 0;
            }
        }
        catch (std::ios_base::failure& )
        {
        }

        t.seconds(sec);
        t.nanosec(nano);

        input.exceptions(excp_mask);
    }

    return input;
}

static inline Time_t operator +(
        const Time_t& ta,
        const Time_t& tb)
{
    Time_t result(ta.seconds() + tb.seconds(), ta.fraction() + tb.fraction());
    if (result.fraction() < ta.fraction()) // Overflow is detected by any of them
    {
        ++result.seconds();
    }
    return result;
}

static inline Time_t operator -(
        const Time_t& ta,
        const Time_t& tb)
{
    Time_t result(ta.seconds() - tb.seconds(), ta.fraction() - tb.fraction());
    if (result.fraction() > ta.fraction()) // Overflow is detected by ta
    {
        --result.seconds();
    }
    return result;
}

#endif // ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

const Time_t c_RTPSTimeInfinite{0x7fffffff, 0xffffffff};
const Time_t c_RTPSTimeZero{0, 0};
const Time_t c_RTPSTimeInvalid{-1, 0xffffffff};

} // namespace rtps

#ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

static inline bool operator ==(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds != t2.seconds)
    {
        return false;
    }
    if (t1.nanosec != t2.nanosec)
    {
        return false;
    }
    return true;
}

static inline bool operator !=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds != t2.seconds)
    {
        return true;
    }
    if (t1.nanosec != t2.nanosec)
    {
        return true;
    }
    return false;
}

static inline bool operator <(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds < t2.seconds)
    {
        return true;
    }
    else if (t1.seconds > t2.seconds)
    {
        return false;
    }
    else
    {
        if (t1.nanosec < t2.nanosec)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator >(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds > t2.seconds)
    {
        return true;
    }
    else if (t1.seconds < t2.seconds)
    {
        return false;
    }
    else
    {
        if (t1.nanosec > t2.nanosec)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator <=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds < t2.seconds)
    {
        return true;
    }
    else if (t1.seconds > t2.seconds)
    {
        return false;
    }
    else
    {
        if (t1.nanosec <= t2.nanosec)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

static inline bool operator >=(
        const Time_t& t1,
        const Time_t& t2)
{
    if (t1.seconds > t2.seconds)
    {
        return true;
    }
    else if (t1.seconds < t2.seconds)
    {
        return false;
    }
    else
    {
        if (t1.nanosec >= t2.nanosec)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

inline std::ostream& operator <<(
        std::ostream& output,
        const Time_t& t)
{
    long double t_aux = t.seconds + (((long double)t.nanosec) / 1000000000ULL);
    return output << t_aux;
}

static inline Time_t operator +(
        const Time_t& ta,
        const Time_t& tb)
{
    Time_t result(ta.seconds + tb.seconds, ta.nanosec + tb.nanosec);
    if (result.nanosec < ta.nanosec) // Overflow is detected by any of them
    {
        ++result.seconds;
    }
    return result;
}

static inline Time_t operator -(
        const Time_t& ta,
        const Time_t& tb)
{
    Time_t result(ta.seconds - tb.seconds, ta.nanosec - tb.nanosec);
    if (result.nanosec > ta.nanosec) // Overflow is detected by ta
    {
        --result.seconds;
    }
    return result;
}

#endif // ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

const Time_t c_TimeInfinite{Time_t::INFINITE_SECONDS, Time_t::INFINITE_NANOSECONDS};
const Time_t c_TimeZero{0, 0};
const Time_t c_TimeInvalid{-1, Time_t::INFINITE_NANOSECONDS};

} // namespace fastrtps
} // namespace eprosima

// defines to avoid the "static initialization order fiasco"
#define TIME_T_INFINITE_SECONDS (eprosima::fastrtps::Time_t::INFINITE_SECONDS)
#define TIME_T_INFINITE_NANOSECONDS (eprosima::fastrtps::Time_t::INFINITE_NANOSECONDS)

#endif /* _FASTDDS_RTPS_TIME_T_H_ */