Duration.h

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// Duration.h
//
// Copyright (c) 2013, 2015 Michael Imamura.
//
// Licensed under GrokkSoft HoverRace SourceCode License v1.0(the "License");
// you may not use this file except in compliance with the License.
//
// A copy of the license should have been attached to the package from which
// you have taken this file. If you can not find the license you can not use
// this file.
//
//
// The author makes no representations about the suitability of
// this software for any purpose.  It is provided "as is" "AS IS",
// 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.

#pragma once

#include <iomanip>

#include <boost/operators.hpp>

#include "MR_Types.h"
#include "OS.h"

#if defined(_WIN32) && defined(HR_ENGINE_SHARED)
#   ifdef MR_ENGINE
#       define MR_DllDeclare   __declspec( dllexport )
#   else
#       define MR_DllDeclare   __declspec( dllimport )
#   endif
#else
#   define MR_DllDeclare
#endif

namespace HoverRace {
namespace Util {

class MR_DllDeclare Duration :
    private boost::totally_ordered<Duration, Duration>,
    private boost::totally_ordered<Duration, MR_Int64>
{
public:
    using dur_t = MR_Int64;

    constexpr Duration(OS::timestamp_t later, OS::timestamp_t earlier)
        noexcept :
        duration(OS::TimeDiff(later, earlier)) { }

    constexpr Duration(const Duration &later, const Duration &earlier)
        noexcept :
        duration(later.duration - earlier.duration) { }

    constexpr Duration(dur_t duration = 0) noexcept : duration(duration) { }

    Duration(const std::string &s) : Duration(ParseDuration(s)) { }

    // Fix ambiguity between char* and dur_t.
    // See specialization for T=char below.
    template<class T>
    Duration(const T *s);

    constexpr Duration(const Duration&) noexcept = default;
    constexpr Duration(Duration&&) noexcept = default;

    Duration &operator=(const Duration&) noexcept = default;
    Duration &operator=(Duration&&) noexcept = default;

    constexpr Duration operator-() const noexcept
    {
        return { -duration };
    }

    constexpr dur_t ToMs() const noexcept { return duration; }

private:
    static dur_t ParseDuration(const std::string &s);

public:
    std::ostream &FmtLong(std::ostream &os) const;
    std::string FmtLong() const;
    std::ostream &FmtShort(std::ostream &os) const;
    std::string FmtShort() const;

private:
    dur_t duration;

    friend constexpr bool operator==(const Duration &a, const Duration &b) noexcept;
    friend constexpr bool operator==(const Duration &duration, Duration::dur_t ts) noexcept;
    friend constexpr bool operator==(Duration::dur_t ts, const Duration &duration) noexcept;
    friend constexpr bool operator<(const Duration &a, const Duration &b) noexcept;
    friend constexpr bool operator<(const Duration &duration, Duration::dur_t ts) noexcept;
    friend constexpr bool operator<(Duration::dur_t ts, const Duration &duration) noexcept;
};

template<>
inline Duration::Duration(const char *s) : Duration(std::string(s)) { }

inline std::ostream &operator<<(std::ostream &os, const Duration &dur)
{
    return dur.FmtShort(os);
}

inline constexpr bool operator==(const Duration &a, const Duration &b) noexcept
{
    return a.duration == b.duration;
}

inline constexpr bool operator==(const Duration &a, Duration::dur_t b) noexcept
{
    return a.duration == b;
}

inline constexpr bool operator==(Duration::dur_t a, const Duration &b) noexcept
{
    return a == b.duration;
}

inline constexpr bool operator<(const Duration &a, const Duration &b) noexcept
{
    return a.duration < b.duration;
}

inline constexpr bool operator<(const Duration &a, Duration::dur_t b) noexcept
{
    return a.duration < b;
}

inline constexpr bool operator<(Duration::dur_t a, const Duration &b) noexcept
{
    return a < b.duration;
}

}  // namespace Util
}  // namespace HoverRace

#undef MR_DllDeclare