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[hal] Simplify monotonic_clock (#8678)

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The epoch() function, zero() function, and min_time member are all not
part of the std::chrono clock interface.

The default constructor of time_point is
[documented](https://en.cppreference.com/w/cpp/chrono/time_point/time_point.html)
to initialize to the clock's epoch.
This commit is contained in:
Tyler Veness
2026-03-15 20:42:52 -07:00
committed by GitHub
parent 14e2c1c4cf
commit 86dd3ca2b7
2 changed files with 6 additions and 13 deletions
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16
hal/src/main/native/include/wpi/hal/monotonic_clock.hpp
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@@ -5,7 +5,6 @@
#pragma once
#include <chrono>
#include <limits>
#include "wpi/hal/HAL.h"
@@ -22,17 +21,12 @@ class monotonic_clock {
using duration = std::chrono::microseconds;
using time_point = std::chrono::time_point<monotonic_clock>;
static time_point now() noexcept {
uint64_t currentTime = HAL_GetMonotonicTime();
return time_point(std::chrono::microseconds(currentTime));
}
static constexpr bool is_steady = true;
static time_point epoch() noexcept { return time_point(zero()); }
static duration zero() noexcept { return duration(0); }
static constexpr time_point min_time =
time_point(duration(std::numeric_limits<duration::rep>::min()));
static time_point now() noexcept {
uint64_t currentTime = HAL_GetMonotonicTime();
return time_point{std::chrono::microseconds{currentTime}};
}
};
} // namespace wpi::hal

3
wpilibc/src/main/native/include/wpi/system/Tracer.hpp
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@@ -66,8 +66,7 @@ class Tracer {
static constexpr std::chrono::milliseconds kMinPrintPeriod{1000};
wpi::hal::monotonic_clock::time_point m_startTime;
wpi::hal::monotonic_clock::time_point m_lastEpochsPrintTime =
wpi::hal::monotonic_clock::epoch();
wpi::hal::monotonic_clock::time_point m_lastEpochsPrintTime;
wpi::util::StringMap<std::chrono::nanoseconds> m_epochs;
};