SFML/include/SFML/System/Time.hpp

////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2022 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////

#ifndef SFML_TIME_HPP
#define SFML_TIME_HPP

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/Export.hpp>

#include <chrono>
#include <cstdint>


namespace sf
{
////////////////////////////////////////////////////////////
/// \brief Represents a time value
///
////////////////////////////////////////////////////////////
class Time
{
public:
    ////////////////////////////////////////////////////////////
    /// \brief Default constructor
    ///
    /// Sets the time value to zero.
    ///
    ////////////////////////////////////////////////////////////
    constexpr Time();

    ////////////////////////////////////////////////////////////
    /// \brief Construct from std::chrono::duration
    ///
    ////////////////////////////////////////////////////////////
    template <typename Rep, typename Period>
    constexpr Time(const std::chrono::duration<Rep, Period>& duration);

    ////////////////////////////////////////////////////////////
    /// \brief Return the time value as a number of seconds
    ///
    /// \return Time in seconds
    ///
    /// \see asMilliseconds, asMicroseconds
    ///
    ////////////////////////////////////////////////////////////
    constexpr float asSeconds() const;

    ////////////////////////////////////////////////////////////
    /// \brief Return the time value as a number of milliseconds
    ///
    /// \return Time in milliseconds
    ///
    /// \see asSeconds, asMicroseconds
    ///
    ////////////////////////////////////////////////////////////
    constexpr std::int32_t asMilliseconds() const;

    ////////////////////////////////////////////////////////////
    /// \brief Return the time value as a number of microseconds
    ///
    /// \return Time in microseconds
    ///
    /// \see asSeconds, asMilliseconds
    ///
    ////////////////////////////////////////////////////////////
    constexpr std::int64_t asMicroseconds() const;

    ////////////////////////////////////////////////////////////
    /// \brief Return the time value as a std::chorono::duration
    ///
    /// \return Time in microseconds
    ///
    ////////////////////////////////////////////////////////////
    constexpr std::chrono::microseconds toDuration() const;

    ////////////////////////////////////////////////////////////
    /// \brief Implicit conversion to std::chrono::duration
    ///
    /// \return Duration in microseconds
    ///
    ////////////////////////////////////////////////////////////
    template <typename Rep, typename Period>
    constexpr operator std::chrono::duration<Rep, Period>() const;

    ////////////////////////////////////////////////////////////
    // Static member data
    ////////////////////////////////////////////////////////////
    // NOLINTNEXTLINE(readability-identifier-naming)
    static const Time Zero; //!< Predefined "zero" time value

private:
    friend constexpr Time seconds(float);
    friend constexpr Time milliseconds(std::int32_t);
    friend constexpr Time microseconds(std::int64_t);

private:
    ////////////////////////////////////////////////////////////
    // Member data
    ////////////////////////////////////////////////////////////
    std::chrono::microseconds m_microseconds{0}; //!< Time value stored as microseconds
};

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Construct a time value from a number of seconds
///
/// \param amount Number of seconds
///
/// \return Time value constructed from the amount of seconds
///
/// \see milliseconds, microseconds
///
////////////////////////////////////////////////////////////
constexpr Time seconds(float amount);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Construct a time value from a number of milliseconds
///
/// \param amount Number of milliseconds
///
/// \return Time value constructed from the amount of milliseconds
///
/// \see seconds, microseconds
///
////////////////////////////////////////////////////////////
constexpr Time milliseconds(std::int32_t amount);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Construct a time value from a number of microseconds
///
/// \param amount Number of microseconds
///
/// \return Time value constructed from the amount of microseconds
///
/// \see seconds, milliseconds
///
////////////////////////////////////////////////////////////
constexpr Time microseconds(std::int64_t amount);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of == operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if both time values are equal
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator==(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of != operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if both time values are different
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator!=(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of < operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if \a left is lesser than \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator<(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of > operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if \a left is greater than \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator>(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of <= operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if \a left is lesser or equal than \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator<=(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of >= operator to compare two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return True if \a left is greater or equal than \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr bool operator>=(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of unary - operator to negate a time value
///
/// \param right Right operand (a time)
///
/// \return Opposite of the time value
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator-(Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary + operator to add two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return Sum of the two times values
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator+(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary += operator to add/assign two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return Sum of the two times values
///
////////////////////////////////////////////////////////////
constexpr Time& operator+=(Time& left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary - operator to subtract two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return Difference of the two times values
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator-(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary -= operator to subtract/assign two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return Difference of the two times values
///
////////////////////////////////////////////////////////////
constexpr Time& operator-=(Time& left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary * operator to scale a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator*(Time left, float right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary * operator to scale a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator*(Time left, std::int64_t right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary * operator to scale a time value
///
/// \param left  Left operand (a number)
/// \param right Right operand (a time)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator*(float left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary * operator to scale a time value
///
/// \param left  Left operand (a number)
/// \param right Right operand (a time)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator*(std::int64_t left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary *= operator to scale/assign a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
constexpr Time& operator*=(Time& left, float right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary *= operator to scale/assign a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left multiplied by \a right
///
////////////////////////////////////////////////////////////
constexpr Time& operator*=(Time& left, std::int64_t right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary / operator to scale a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left divided by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator/(Time left, float right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary / operator to scale a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left divided by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator/(Time left, std::int64_t right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary /= operator to scale/assign a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left divided by \a right
///
////////////////////////////////////////////////////////////
constexpr Time& operator/=(Time& left, float right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary /= operator to scale/assign a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a number)
///
/// \return \a left divided by \a right
///
////////////////////////////////////////////////////////////
constexpr Time& operator/=(Time& left, std::int64_t right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary / operator to compute the ratio of two time values
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return \a left divided by \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr float operator/(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary % operator to compute remainder of a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return \a left modulo \a right
///
////////////////////////////////////////////////////////////
[[nodiscard]] constexpr Time operator%(Time left, Time right);

////////////////////////////////////////////////////////////
/// \relates Time
/// \brief Overload of binary %= operator to compute/assign remainder of a time value
///
/// \param left  Left operand (a time)
/// \param right Right operand (a time)
///
/// \return \a left modulo \a right
///
////////////////////////////////////////////////////////////
constexpr Time& operator%=(Time& left, Time right);

#include <SFML/System/Time.inl>

} // namespace sf


#endif // SFML_TIME_HPP


////////////////////////////////////////////////////////////
/// \class sf::Time
/// \ingroup system
///
/// sf::Time encapsulates a time value in a flexible way.
/// It allows to define a time value either as a number of
/// seconds, milliseconds or microseconds. It also works the
/// other way round: you can read a time value as either
/// a number of seconds, milliseconds or microseconds. It
/// even interoperates with the <chrono> header. You can
/// construct an sf::Time from a chrono::duration and read
/// any sf::Time as a chrono::duration.
///
/// By using such a flexible interface, the API doesn't
/// impose any fixed type or resolution for time values,
/// and let the user choose its own favorite representation.
///
/// Time values support the usual mathematical operations:
/// you can add or subtract two times, multiply or divide
/// a time by a number, compare two times, etc.
///
/// Since they represent a time span and not an absolute time
/// value, times can also be negative.
///
/// Usage example:
/// \code
/// sf::Time t1 = sf::seconds(0.1f);
/// std::int32_t milli = t1.asMilliseconds(); // 100
///
/// sf::Time t2 = sf::milliseconds(30);
/// std::int64_t micro = t2.asMicroseconds(); // 30000
///
/// sf::Time t3 = sf::microseconds(-800000);
/// float sec = t3.asSeconds(); // -0.8
///
/// sf::Time t4 = std::chrono::milliseconds(250);
/// std::chrono::microseconds micro2 = t4.toDuration(); // 250000us
/// \endcode
///
/// \code
/// void update(sf::Time elapsed)
/// {
///    position += speed * elapsed.asSeconds();
/// }
///
/// update(sf::milliseconds(100));
/// \endcode
///
/// \see sf::Clock
///
////////////////////////////////////////////////////////////