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// { dg-options "-std=gnu++20" }
// { dg-do run { target c++20 } }
#include <chrono>
#include <testsuite_hooks.h>
void
test01()
{
using namespace std::chrono;
gps_seconds gps_epoch{0s};
utc_seconds gps_as_utc{sys_days{1980y/January/Sunday[1]}.time_since_epoch() + 9s};
VERIFY( clock_cast<utc_clock>(gps_epoch) == gps_as_utc );
VERIFY( gps_epoch == clock_cast<gps_clock>(gps_as_utc) );
tai_seconds tai_epoch{0s};
VERIFY( clock_cast<tai_clock>(clock_cast<gps_clock>(tai_epoch)) == tai_epoch );
}
void
test02()
{
using namespace std::chrono;
sys_days d{2022y/November/12};
VERIFY( clock_cast<system_clock>(clock_cast<gps_clock>(d)) == d );
gps_seconds t(1234567s);
VERIFY( clock_cast<gps_clock>(clock_cast<system_clock>(t)) == t );
VERIFY( clock_cast<gps_clock>(clock_cast<utc_clock>(t)) == t );
}
void
test03()
{
using namespace std::chrono;
gps_time<gps_clock::duration> gps1 = gps_clock::now();
utc_time<utc_clock::duration> utc = utc_clock::now();
gps_time<gps_clock::duration> gps2 = gps_clock::now();
auto delta = gps2 - gps1;
VERIFY( (utc - clock_cast<utc_clock>(gps1)) <= delta );
VERIFY( (clock_cast<utc_clock>(gps2) - utc) <= delta );
gps_seconds s = time_point_cast<seconds>(gps1);
VERIFY( gps1 - s < 1s );
}
int main()
{
test01();
test02();
test03();
}
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