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AK: Take advantage of constexpr in Time and add time conversion methods

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By making the Time constructor constexpr we can optimize creating a
Time instance from hardcoded values.

Also add more functions to convert between Time and various time units.
This commit is contained in:
Tom 2021-03-07 23:34:13 -07:00 • committed by Andreas Kling
parent 42bc229500
commit 183b2e71ba
3 changed files with 207 additions and 18 deletions
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42
AK/Time.h
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@ -84,9 +84,35 @@ class Time {
public:
Time() = default;
Time(const Time&) = default;
Time& operator=(const Time&) = default;
static Time from_seconds(i64 seconds) { return Time(seconds, 0); }
static Time from_nanoseconds(i32 nanoseconds);
Time(Time&& other)
: m_seconds(exchange(other.m_seconds, 0))
, m_nanoseconds(exchange(other.m_nanoseconds, 0))
{
}
Time& operator=(Time&& other)
{
if (this != &other) {
m_seconds = exchange(other.m_seconds, 0);
m_nanoseconds = exchange(other.m_nanoseconds, 0);
}
return *this;
}
constexpr static Time from_seconds(i64 seconds) { return Time(seconds, 0); }
constexpr static Time from_nanoseconds(i64 nanoseconds)
{
return Time(nanoseconds / 1'000'000'000, nanoseconds % 1'000'000'000);
}
constexpr static Time from_microseconds(i64 microseconds)
{
return Time(microseconds / 1'000'000, (microseconds % 1'000'000) * 1'000);
}
constexpr static Time from_milliseconds(i64 milliseconds)
{
return Time(milliseconds / 1'000, (milliseconds % 1'000) * 1'000'000);
}
static Time from_timespec(const struct timespec&);
static Time from_timeval(const struct timeval&);
static Time min() { return Time(-0x8000'0000'0000'0000LL, 0); };
@ -96,20 +122,30 @@ public:
// Truncates "2.8 seconds" to 2 seconds.
// Truncates "-2.8 seconds" to -2 seconds.
i64 to_truncated_seconds() const;
i64 to_truncated_milliseconds() const;
i64 to_truncated_microseconds() const;
i64 to_seconds() const;
i64 to_milliseconds() const;
i64 to_microseconds() const;
i64 to_nanoseconds() const;
timespec to_timespec() const;
timeval to_timeval() const;
bool is_zero() const { return !m_seconds && !m_nanoseconds; }
bool operator==(const Time& other) const { return this->m_seconds == other.m_seconds && this->m_nanoseconds == other.m_nanoseconds; }
bool operator!=(const Time& other) const { return !(*this == other); }
Time operator+(const Time& other) const;
Time& operator+=(const Time& other);
Time operator-(const Time& other) const;
Time& operator-=(const Time& other);
bool operator<(const Time& other) const;
bool operator<=(const Time& other) const;
bool operator>(const Time& other) const;
bool operator>=(const Time& other) const;
private:
explicit Time(i64 seconds, u32 nanoseconds)
constexpr explicit Time(i64 seconds, u32 nanoseconds)
: m_seconds(seconds)
, m_nanoseconds(nanoseconds)
{