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Use LIBCPP_STATIC_ASSERT in chrono test #132566

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4d69301
get rid off temporary (maybe_unused)
PaulXiCao Mar 22, 2025
7fa98a2
is_steady: testing type and value
PaulXiCao Mar 23, 2025
d76f438
testing older clock's is_steady type (and optionally value)
PaulXiCao Mar 23, 2025
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11 changes: 6 additions & 5 deletions libcxx/test/std/time/time.clock/time.clock.gps/types.compile.pass.cpp
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Expand Up @@ -36,11 +36,12 @@
#include "test_macros.h"

// class gps_clock
using rep = std::chrono::gps_clock::rep;
using period = std::chrono::gps_clock::period;
using duration = std::chrono::gps_clock::duration;
using time_point = std::chrono::gps_clock::time_point;
[[maybe_unused]] constexpr bool is_steady = std::chrono::gps_clock::is_steady;
using rep = std::chrono::gps_clock::rep;
using period = std::chrono::gps_clock::period;
using duration = std::chrono::gps_clock::duration;
using time_point = std::chrono::gps_clock::time_point;

[[maybe_unused]] constexpr std::same_as<const bool> decltype(auto) is_steady = std::chrono::gps_clock::is_steady;

// Tests the values. part of them are implementation defined.
LIBCPP_STATIC_ASSERT(std::same_as<rep, std::chrono::utc_clock::rep>);
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2 changes: 1 addition & 1 deletion libcxx/test/std/time/time.clock/time.clock.hires/consistency.pass.cpp
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Expand Up @@ -30,7 +30,7 @@ int main(int, char**)
static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
static_assert((std::is_same<C::period, C::duration::period>::value), "");
static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
static_assert(C::is_steady || !C::is_steady, "");
static_assert(std::is_same<decltype(C::is_steady), const bool>::value, "");
test(std::chrono::high_resolution_clock::is_steady);
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@PaulXiCao PaulXiCao Mar 23, 2025 •
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Does someone know what the line test(...::is_steady); is supposed to test?
Incase it is just testing that the member exists it is probably already enough to have the static_assert line above?

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@mordante mordante Mar 24, 2025

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The is_steady tests whether the clock is steady. This means the clock has no time jumps. For some clocks the Standard requires them to be steady, for others it's implementation defined. The [time.clock] has the information. When unspecified we need a LIBCPP_ASSERT to validate the value libc++ uses.


return 0;
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2 changes: 1 addition & 1 deletion libcxx/test/std/time/time.clock/time.clock.steady/consistency.pass.cpp
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Expand Up @@ -32,7 +32,7 @@ int main(int, char**)
static_assert((std::is_same<C::rep, C::duration::rep>::value), "");
static_assert((std::is_same<C::period, C::duration::period>::value), "");
static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
static_assert(C::is_steady, "");
static_assert(std::is_same<decltype(C::is_steady), const bool>::value && C::is_steady, "");
test(std::chrono::steady_clock::is_steady);

return 0;
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2 changes: 1 addition & 1 deletion libcxx/test/std/time/time.clock/time.clock.system/consistency.pass.cpp
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Expand Up @@ -31,7 +31,7 @@ int main(int, char**)
static_assert((std::is_same<C::period, C::duration::period>::value), "");
static_assert((std::is_same<C::duration, C::time_point::duration>::value), "");
static_assert((std::is_same<C::time_point::clock, C>::value), "");
static_assert((C::is_steady || !C::is_steady), "");
static_assert(std::is_same<decltype(C::is_steady), const bool>::value, "");
test(std::chrono::system_clock::is_steady);

return 0;
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11 changes: 6 additions & 5 deletions libcxx/test/std/time/time.clock/time.clock.tai/types.compile.pass.cpp
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Expand Up @@ -36,11 +36,12 @@
#include "test_macros.h"

// class tai_clock
using rep = std::chrono::tai_clock::rep;
using period = std::chrono::tai_clock::period;
using duration = std::chrono::tai_clock::duration;
using time_point = std::chrono::tai_clock::time_point;
[[maybe_unused]] constexpr bool is_steady = std::chrono::tai_clock::is_steady;
using rep = std::chrono::tai_clock::rep;
using period = std::chrono::tai_clock::period;
using duration = std::chrono::tai_clock::duration;
using time_point = std::chrono::tai_clock::time_point;

[[maybe_unused]] constexpr std::same_as<const bool> decltype(auto) is_steady = std::chrono::tai_clock::is_steady;

// Tests the values. part of them are implementation defined.
LIBCPP_STATIC_ASSERT(std::same_as<rep, std::chrono::utc_clock::rep>);
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11 changes: 6 additions & 5 deletions libcxx/test/std/time/time.clock/time.clock.utc/types.compile.pass.cpp
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Expand Up @@ -36,11 +36,12 @@
#include "test_macros.h"

// class utc_clock
using rep = std::chrono::utc_clock::rep;
using period = std::chrono::utc_clock::period;
using duration = std::chrono::utc_clock::duration;
using time_point = std::chrono::utc_clock::time_point;
[[maybe_unused]] constexpr bool is_steady = std::chrono::utc_clock::is_steady;
using rep = std::chrono::utc_clock::rep;
using period = std::chrono::utc_clock::period;
using duration = std::chrono::utc_clock::duration;
using time_point = std::chrono::utc_clock::time_point;

[[maybe_unused]] constexpr std::same_as<const bool> decltype(auto) is_steady = std::chrono::utc_clock::is_steady;

// Tests the values. Some of them are implementation-defined.
LIBCPP_STATIC_ASSERT(std::same_as<rep, std::chrono::system_clock::rep>);
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