/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <folly/chrono/Conv.h>
#include <limits>
#include <glog/logging.h>
#include <folly/portability/GTest.h>
using namespace folly;
using namespace std::chrono;
using namespace std::chrono_literals;
namespace {
/**
* A helper function to create a time_point even if the input duration type has
* finer resolution than the clock duration type.
*/
template <typename Clock, typename Duration>
typename Clock::time_point createTimePoint(const Duration& d) {
return typename Clock::time_point(
std::chrono::duration_cast<typename Clock::duration>(d));
}
} // namespace
TEST(Conv, timespecToStdChrono) {
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 10;
EXPECT_EQ(10ns, to<nanoseconds>(ts));
EXPECT_EQ(0us, to<microseconds>(ts));
EXPECT_EQ(0ms, to<milliseconds>(ts));
EXPECT_EQ(0s, to<seconds>(ts));
ts.tv_sec = 1;
ts.tv_nsec = 10;
EXPECT_EQ(1000000010ns, to<nanoseconds>(ts));
EXPECT_EQ(1000000us, to<microseconds>(ts));
EXPECT_EQ(1000ms, to<milliseconds>(ts));
EXPECT_EQ(1s, to<seconds>(ts));
EXPECT_EQ(
createTimePoint<system_clock>(1000000010ns),
to<system_clock::time_point>(ts));
EXPECT_EQ(
createTimePoint<steady_clock>(1000000010ns),
to<steady_clock::time_point>(ts));
// Test a non-canonical value with tv_nsec larger than 1 second
ts.tv_sec = 5;
ts.tv_nsec = 3219876543;
// Beware about using std::chrono_literals suffixes with very literals:
// older versions of GCC are buggy and would truncate these to 32-bits.
EXPECT_EQ(8219876543LL, to<nanoseconds>(ts).count());
EXPECT_EQ(8219876us, to<microseconds>(ts));
EXPECT_EQ(8219ms, to<milliseconds>(ts));
EXPECT_EQ(8s, to<seconds>(ts));
EXPECT_EQ(
createTimePoint<system_clock>(nanoseconds(8219876543LL)),
to<system_clock::time_point>(ts));
EXPECT_EQ(
createTimePoint<steady_clock>(nanoseconds(8219876543LL)),
to<steady_clock::time_point>(ts));
// Test negative values
// When going to coarser grained types these should be rounded up towards 0.
ts.tv_sec = -5;
ts.tv_nsec = 123456;
EXPECT_EQ(-4999876544, to<nanoseconds>(ts).count());
EXPECT_EQ(-4999876544, duration_cast<nanoseconds>(-5s + 123456ns).count());
EXPECT_EQ(-4999876, to<microseconds>(ts).count());
EXPECT_EQ(-4999876, duration_cast<microseconds>(-5s + 123456ns).count());
EXPECT_EQ(-4999, to<milliseconds>(ts).count());
EXPECT_EQ(-4999, duration_cast<milliseconds>(-5s + 123456ns).count());
EXPECT_EQ(-4s, to<seconds>(ts));
EXPECT_EQ(-4, duration_cast<seconds>(-5s + 123456ns).count());
ts.tv_sec = -7200;
ts.tv_nsec = 123456;
EXPECT_EQ(-1h, to<hours>(ts));
EXPECT_EQ(
-1,
duration_cast<hours>(seconds{ts.tv_sec} + nanoseconds{ts.tv_nsec})
.count());
ts.tv_sec = -7000;
ts.tv_nsec = 123456;
EXPECT_EQ(-1h, to<hours>(ts));
EXPECT_EQ(
-1,
duration_cast<hours>(seconds{ts.tv_sec} + nanoseconds{ts.tv_nsec})
.count());
ts.tv_sec = -7201;
ts.tv_nsec = 123456;
EXPECT_EQ(-2h, to<hours>(ts));
EXPECT_EQ(
-2,
duration_cast<hours>(seconds{ts.tv_sec} + nanoseconds{ts.tv_nsec})
.count());
// Test converions to floating point durations
ts.tv_sec = 1;
ts.tv_nsec = 500000000;
EXPECT_EQ(1.5, to<duration<double>>(ts).count());
ts.tv_sec = -1;
ts.tv_nsec = 500000000;
EXPECT_EQ(-0.5, to<duration<double>>(ts).count());
ts.tv_sec = -1;
ts.tv_nsec = -500000000;
EXPECT_EQ(-1.5, to<duration<double>>(ts).count());
ts.tv_sec = 1;
ts.tv_nsec = 500000000;
auto doubleNanos = to<duration<double, std::nano>>(ts);
EXPECT_EQ(1500000000, doubleNanos.count());
ts.tv_sec = 90;
ts.tv_nsec = 0;
auto doubleMinutes = to<duration<double, std::ratio<60>>>(ts);
EXPECT_EQ(1.5, doubleMinutes.count());
// Test with unusual durations where neither the numerator nor denominator
// are 1.
using five_sevenths = std::chrono::duration<int64_t, std::ratio<5, 7>>;
ts.tv_sec = 1;
ts.tv_nsec = 0;
EXPECT_EQ(1, to<five_sevenths>(ts).count());
ts.tv_sec = 1;
ts.tv_nsec = 428571500;
EXPECT_EQ(2, to<five_sevenths>(ts).count());
using thirteen_thirds = std::chrono::duration<double, std::ratio<13, 3>>;
ts.tv_sec = 39;
ts.tv_nsec = 0;
EXPECT_NEAR(9.0, to<thirteen_thirds>(ts).count(), 0.000000001);
ts.tv_sec = 1;
ts.tv_nsec = 0;
EXPECT_NEAR(0.230769230, to<thirteen_thirds>(ts).count(), 0.000000001);
}
TEST(Conv, timespecToStdChronoOverflow) {
struct timespec ts;
// All of our boundary conditions below assume time_t is int64_t.
// This is true on most modern platforms.
if (!std::is_same<decltype(ts.tv_sec), int64_t>::value) {
LOG(INFO) << "skipping most overflow tests: time_t is not int64_t";
} else {
// Test the upper boundary of conversion to uint64_t nanoseconds
using nsec_u64 = std::chrono::duration<uint64_t, std::nano>;
ts.tv_sec = 18446744073;
ts.tv_nsec = 709551615;
EXPECT_EQ(std::numeric_limits<uint64_t>::max(), to<nsec_u64>(ts).count());
ts.tv_nsec += 1;
EXPECT_THROW(to<nsec_u64>(ts), std::range_error);
// Test the lower boundary of conversion to uint64_t nanoseconds
ts.tv_sec = 0;
ts.tv_nsec = 0;
EXPECT_EQ(0, to<nsec_u64>(ts).count());
ts.tv_sec = -1;
ts.tv_nsec = 0;
EXPECT_THROW(to<nsec_u64>(ts), std::range_error);
// Test the upper boundary of conversion to int64_t microseconds
using usec_i64 = std::chrono::duration<int64_t, std::micro>;
ts.tv_sec = 9223372036854LL;
ts.tv_nsec = 775807000;
EXPECT_EQ(std::numeric_limits<int64_t>::max(), to<usec_i64>(ts).count());
ts.tv_nsec += 1;
EXPECT_THROW(to<usec_i64>(ts), std::range_error);
// Test the lower boundary of conversion to int64_t microseconds
ts.tv_sec = -9223372036855LL;
ts.tv_nsec = 224192000;
EXPECT_EQ(std::numeric_limits<int64_t>::min(), to<usec_i64>(ts).count());
ts.tv_nsec -= 1;
EXPECT_THROW(to<usec_i64>(ts), std::range_error);
// Test the boundaries of conversion to int32_t seconds
using sec_i32 = std::chrono::duration<int32_t>;
ts.tv_sec = 2147483647;
ts.tv_nsec = 0;
EXPECT_EQ(std::numeric_limits<int32_t>::max(), to<sec_i32>(ts).count());
ts.tv_nsec = 1000000000;
EXPECT_THROW(to<sec_i32>(ts), std::range_error);
ts.tv_sec = -2147483648;
ts.tv_nsec = 0;
EXPECT_EQ(std::numeric_limits<int32_t>::min(), to<sec_i32>(ts).count());
ts.tv_sec = -2147483649;
ts.tv_nsec = 999999999;
EXPECT_THROW(to<sec_i32>(ts), std::range_error);
ts.tv_sec = -2147483649;
ts.tv_nsec = 0;
EXPECT_THROW(to<sec_i32>(ts), std::range_error);
ts.tv_sec = -2147483650;
ts.tv_nsec = 0;
EXPECT_THROW(to<sec_i32>(ts), std::range_error);
// Test the upper boundary of conversion to uint32_t hours
using hours_u32 = std::chrono::duration<uint32_t, std::ratio<3600>>;
ts.tv_sec = 15461882262000LL;
ts.tv_nsec = 0;
EXPECT_EQ(std::numeric_limits<uint32_t>::max(), to<hours_u32>(ts).count());
ts.tv_sec = 15461882265599LL;
EXPECT_EQ(std::numeric_limits<uint32_t>::max(), to<hours_u32>(ts).count());
ts.tv_sec = 15461882265600LL;
EXPECT_THROW(to<hours_u32>(ts), std::range_error);
using nsec_i64 = std::chrono::duration<int64_t, std::nano>;
ts.tv_sec = std::numeric_limits<int64_t>::max();
ts.tv_nsec = std::numeric_limits<int64_t>::max();
EXPECT_THROW(to<nsec_i64>(ts), std::range_error);
ts.tv_sec = std::numeric_limits<int64_t>::min();
ts.tv_nsec = std::numeric_limits<int64_t>::min();
EXPECT_THROW(to<nsec_i64>(ts), std::range_error);
// Test some non-normal inputs near the int64_t limit
ts.tv_sec = 0;
ts.tv_nsec = std::numeric_limits<int64_t>::min();
EXPECT_EQ(std::numeric_limits<int64_t>::min(), to<nsec_i64>(ts).count());
ts.tv_sec = -1;
ts.tv_nsec = std::numeric_limits<int64_t>::min() + std::nano::den;
EXPECT_EQ(std::numeric_limits<int64_t>::min(), to<nsec_i64>(ts).count());
ts.tv_sec = -1;
ts.tv_nsec = std::numeric_limits<int64_t>::min() + std::nano::den - 1;
EXPECT_THROW(to<nsec_i64>(ts), std::range_error);
ts.tv_sec = 0;
ts.tv_nsec = std::numeric_limits<int64_t>::max();
EXPECT_EQ(std::numeric_limits<int64_t>::max(), to<nsec_i64>(ts).count());
ts.tv_sec = 1;
ts.tv_nsec = std::numeric_limits<int64_t>::max() - std::nano::den;
EXPECT_EQ(std::numeric_limits<int64_t>::max(), to<nsec_i64>(ts).count());
ts.tv_sec = 1;
ts.tv_nsec = std::numeric_limits<int64_t>::max() - std::nano::den + 1;
EXPECT_THROW(to<nsec_i64>(ts), std::range_error);
}
// Theoretically conversion is representable in the output type,
// but we normalize the input first, and normalization would trigger an
// overflow.
using hours_u64 = std::chrono::duration<uint64_t, std::ratio<3600>>;
ts.tv_sec = std::numeric_limits<decltype(ts.tv_sec)>::max();
ts.tv_nsec = 1000000000;
EXPECT_THROW(to<hours_u64>(ts), std::range_error);
// If we drop it back down to the normal range it should succeed
ts.tv_nsec = 999999999;
EXPECT_EQ(
std::numeric_limits<decltype(ts.tv_sec)>::max() / 3600,
to<hours_u64>(ts).count());
// Test overflow with an unusual duration where neither the numerator nor
// denominator are 1.
using unusual_time = std::chrono::duration<int16_t, std::ratio<13, 3>>;
ts.tv_sec = 141994;
ts.tv_nsec = 666666666;
EXPECT_EQ(32767, to<unusual_time>(ts).count());
ts.tv_nsec = 666666667;
EXPECT_THROW(to<unusual_time>(ts), std::range_error);
ts.tv_sec = -141998;
ts.tv_nsec = 999999999;
EXPECT_EQ(-32768, to<unusual_time>(ts).count());
ts.tv_sec = -141999;
ts.tv_nsec = 0;
EXPECT_THROW(to<unusual_time>(ts), std::range_error);
}
TEST(Conv, timevalToStdChrono) {
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 10;
EXPECT_EQ(10000ns, to<nanoseconds>(tv));
EXPECT_EQ(10us, to<microseconds>(tv));
EXPECT_EQ(0ms, to<milliseconds>(tv));
EXPECT_EQ(0s, to<seconds>(tv));
tv.tv_sec = 1;
tv.tv_usec = 10;
EXPECT_EQ(1000010000ns, to<nanoseconds>(tv));
EXPECT_EQ(1000010us, to<microseconds>(tv));
EXPECT_EQ(1000ms, to<milliseconds>(tv));
EXPECT_EQ(1s, to<seconds>(tv));
EXPECT_EQ(
createTimePoint<system_clock>(1000010000ns),
to<system_clock::time_point>(tv));
EXPECT_EQ(
createTimePoint<steady_clock>(1000010000ns),
to<steady_clock::time_point>(tv));
// Test a non-canonical value with tv_usec larger than 1 second
tv.tv_sec = 5;
tv.tv_usec = 3219876;
EXPECT_EQ(8219876000LL, to<nanoseconds>(tv).count());
EXPECT_EQ(8219876us, to<microseconds>(tv));
EXPECT_EQ(8219ms, to<milliseconds>(tv));
EXPECT_EQ(8s, to<seconds>(tv));
EXPECT_EQ(
createTimePoint<system_clock>(nanoseconds(8219876000LL)),
to<system_clock::time_point>(tv));
EXPECT_EQ(
createTimePoint<steady_clock>(nanoseconds(8219876000LL)),
to<steady_clock::time_point>(tv));
// Test for overflow.
if (std::numeric_limits<decltype(tv.tv_sec)>::max() >=
std::numeric_limits<int64_t>::max()) {
// Use our own type alias here rather than std::chrono::nanoseconds
// to ensure we have 64-bit rep type.
using nsec_i64 = std::chrono::duration<int64_t, std::nano>;
tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::max();
tv.tv_usec = std::numeric_limits<decltype(tv.tv_usec)>::max();
EXPECT_THROW(to<nsec_i64>(tv), std::range_error);
tv.tv_sec = std::numeric_limits<decltype(tv.tv_sec)>::min();
tv.tv_usec = std::numeric_limits<decltype(tv.tv_usec)>::max();
EXPECT_THROW(to<nsec_i64>(tv), std::range_error);
}
}
TEST(Conv, stdChronoToTimespec) {
auto ts = to<struct timespec>(10ns);
EXPECT_EQ(0, ts.tv_sec);
EXPECT_EQ(10, ts.tv_nsec);
// We don't use std::chrono_literals suffixes here since older
// gcc versions silently truncate the literals to 32-bits.
ts = to<struct timespec>(nanoseconds(987654321012LL));
EXPECT_EQ(987, ts.tv_sec);
EXPECT_EQ(654321012, ts.tv_nsec);
ts = to<struct timespec>(nanoseconds(-987654321012LL));
EXPECT_EQ(-988, ts.tv_sec);
EXPECT_EQ(345678988, ts.tv_nsec);
ts = to<struct timespec>(microseconds(987654321012LL));
EXPECT_EQ(987654, ts.tv_sec);
EXPECT_EQ(321012000, ts.tv_nsec);
ts = to<struct timespec>(milliseconds(987654321012LL));
EXPECT_EQ(987654321, ts.tv_sec);
EXPECT_EQ(12000000, ts.tv_nsec);
ts = to<struct timespec>(seconds(987654321012LL));
EXPECT_EQ(987654321012, ts.tv_sec);
EXPECT_EQ(0, ts.tv_nsec);
ts = to<struct timespec>(10h);
EXPECT_EQ(36000, ts.tv_sec);
EXPECT_EQ(0, ts.tv_nsec);
// Must select duration types from the clock for the createTimePoint tests
// since not all clocks on all platforms natively support nanoseconds:
constexpr auto const steady_duration = steady_clock::duration(123);
ts = to<struct timespec>(createTimePoint<steady_clock>(steady_duration));
EXPECT_EQ(0, ts.tv_sec);
EXPECT_EQ(nanoseconds(steady_duration).count(), ts.tv_nsec);
constexpr auto const system_duration = system_clock::duration(123);
ts = to<struct timespec>(createTimePoint<system_clock>(system_duration));
EXPECT_EQ(0, ts.tv_sec);
EXPECT_EQ(nanoseconds(system_duration).count(), ts.tv_nsec);
// Test with some unusual durations where neither the numerator nor
// denominator are 1.
using five_sevenths = std::chrono::duration<int64_t, std::ratio<5, 7>>;
ts = to<struct timespec>(five_sevenths(7));
EXPECT_EQ(5, ts.tv_sec);
EXPECT_EQ(0, ts.tv_nsec);
ts = to<struct timespec>(five_sevenths(19));
EXPECT_EQ(13, ts.tv_sec);
EXPECT_EQ(571428571, ts.tv_nsec);
using seven_fifths = std::chrono::duration<int64_t, std::ratio<7, 5>>;
ts = to<struct timespec>(seven_fifths(5));
EXPECT_EQ(7, ts.tv_sec);
EXPECT_EQ(0, ts.tv_nsec);
}
TEST(Conv, stdChronoToTimespecOverflow) {
EXPECT_THROW(to<uint8_t>(1234), std::range_error);
struct timespec ts;
if (!std::is_same<decltype(ts.tv_sec), int64_t>::value) {
LOG(INFO) << "skipping most overflow tests: time_t is not int64_t";
} else {
// Check for overflow converting from uint64_t seconds to time_t
using sec_u64 = duration<uint64_t>;
ts =
to<struct timespec>(sec_u64(9223372036854775807ULL)); // largest int64_t
EXPECT_EQ(ts.tv_sec, 9223372036854775807ULL);
EXPECT_EQ(ts.tv_nsec, 0);
EXPECT_THROW(
to<struct timespec>(sec_u64(9223372036854775808ULL)), std::range_error);
// Check for overflow converting from int64_t hours to time_t
using hours_i64 = duration<int64_t, std::ratio<3600>>;
ts = to<struct timespec>(hours_i64(2562047788015215LL));
EXPECT_EQ(ts.tv_sec, 9223372036854774000LL);
EXPECT_EQ(ts.tv_nsec, 0);
EXPECT_THROW(
to<struct timespec>(hours_i64(2562047788015216LL)), std::range_error);
// Test overflows from an unusual duration where neither the numerator nor
// denominator are 1.
using three_halves = std::chrono::duration<uint64_t, std::ratio<3, 2>>;
EXPECT_THROW(
to<struct timespec>(three_halves(6148914691236517206ULL)),
std::range_error);
}
// Test for overflow.
// Use a custom hours type using time_t as the underlying storage type to
// guarantee that we can overflow.
using hours_timet = std::chrono::duration<time_t, std::ratio<3600>>;
EXPECT_THROW(
to<struct timespec>(hours_timet(std::numeric_limits<time_t>::max())),
std::range_error);
}
TEST(Conv, stdChronoToTimeval) {
auto tv = to<struct timeval>(10ns);
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(10us);
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(10, tv.tv_usec);
tv = to<struct timeval>(nanoseconds(987654321012LL));
EXPECT_EQ(987, tv.tv_sec);
EXPECT_EQ(654321, tv.tv_usec);
tv = to<struct timeval>(nanoseconds(-987654321012LL));
EXPECT_EQ(-988, tv.tv_sec);
EXPECT_EQ(345679, tv.tv_usec);
tv = to<struct timeval>(microseconds(987654321012LL));
EXPECT_EQ(987654, tv.tv_sec);
EXPECT_EQ(321012, tv.tv_usec);
tv = to<struct timeval>(milliseconds(987654321012LL));
EXPECT_EQ(987654321, tv.tv_sec);
EXPECT_EQ(12000, tv.tv_usec);
tv = to<struct timeval>(seconds(987654321012LL));
EXPECT_EQ(987654321012, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
// Try converting fractional seconds
tv = to<struct timeval>(duration<double>{3.456789});
EXPECT_EQ(3, tv.tv_sec);
EXPECT_EQ(456789, tv.tv_usec);
tv = to<struct timeval>(duration<double>{-3.456789});
EXPECT_EQ(-4, tv.tv_sec);
EXPECT_EQ(543211, tv.tv_usec);
// Try converting integrals with width less than int64_t
tv = to<struct timeval>(
duration<unsigned char>{std::numeric_limits<unsigned char>::max()});
EXPECT_EQ(std::numeric_limits<unsigned char>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<unsigned char>{0});
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<char>{std::numeric_limits<char>::max()});
EXPECT_EQ(std::numeric_limits<char>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<char>{std::numeric_limits<char>::min()});
EXPECT_EQ(std::numeric_limits<char>::min(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(
duration<unsigned short>{std::numeric_limits<unsigned short>::max()});
EXPECT_EQ(std::numeric_limits<unsigned short>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<short>{std::numeric_limits<short>::max()});
EXPECT_EQ(std::numeric_limits<short>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<short>{std::numeric_limits<short>::min()});
EXPECT_EQ(std::numeric_limits<short>::min(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(
duration<unsigned int>{std::numeric_limits<unsigned int>::max()});
EXPECT_EQ(std::numeric_limits<unsigned int>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<int>{std::numeric_limits<int>::max()});
EXPECT_EQ(std::numeric_limits<int>::max(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<int>{std::numeric_limits<int>::min()});
EXPECT_EQ(std::numeric_limits<int>::min(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
// Try converting integral types with a range that is greater than int64_t
tv = to<struct timeval>(duration<uint64_t>{9223372036854775807ULL});
EXPECT_EQ(9223372036854775807ULL, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
#if FOLLY_HAVE_INT128_T
tv = to<struct timeval>(duration<folly::uint128_t>{9223372036854775807ULL});
EXPECT_EQ(9223372036854775807ULL, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<folly::uint128_t>{0});
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<folly::int128_t>{9223372036854775807ULL});
EXPECT_EQ(9223372036854775807ULL, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(
duration<folly::int128_t>{std::numeric_limits<int64_t>::lowest()});
EXPECT_EQ(std::numeric_limits<int64_t>::lowest(), tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
#endif
// Try converting from the lowest floating point that int64_t can represent
tv = to<struct timeval>(duration<float>{-9223372036854775808.f});
EXPECT_EQ(-9223372036854775808.f, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<double>{-9223372036854775808.});
EXPECT_EQ(-9223372036854775808., tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
// Try converting the largest double that is in range of an int64_t
tv = to<struct timeval>(duration<double>{9223372036854774784.0});
EXPECT_EQ(9223372036854774784, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
// Try converting the largest float that is in range of an int64_t
tv = to<struct timeval>(duration<float>{9223371487098961920.0f});
EXPECT_EQ(9223371487098961920, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
// Try converting fractional hours
tv = to<struct timeval>(duration<double, std::ratio<3600>>{3.456789});
EXPECT_EQ(12444, tv.tv_sec);
// The usec field is generally off-by-one due to
// floating point rounding error
EXPECT_NEAR(440400, tv.tv_usec, 1);
tv = to<struct timeval>(duration<double, std::ratio<3600>>{-3.456789});
EXPECT_EQ(-12445, tv.tv_sec);
EXPECT_NEAR(559600, tv.tv_usec, 1);
// Try converting fractional milliseconds
tv = to<struct timeval>(duration<double, std::milli>{9123.456789});
EXPECT_EQ(9, tv.tv_sec);
EXPECT_EQ(123456, tv.tv_usec);
tv = to<struct timeval>(duration<double, std::milli>{-9123.456789});
EXPECT_EQ(-10, tv.tv_sec);
EXPECT_NEAR(876544, tv.tv_usec, 1);
tv = to<struct timeval>(duration<uint32_t, std::ratio<3600>>{3});
EXPECT_EQ(10800, tv.tv_sec);
EXPECT_EQ(0, tv.tv_usec);
tv = to<struct timeval>(duration<uint32_t, std::nano>{3123});
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(3, tv.tv_usec);
tv = to<struct timeval>(duration<int32_t, std::nano>{-3123});
EXPECT_EQ(-1, tv.tv_sec);
EXPECT_EQ(999997, tv.tv_usec);
tv = to<struct timeval>(createTimePoint<steady_clock>(123us));
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(123, tv.tv_usec);
tv = to<struct timeval>(createTimePoint<system_clock>(123us));
EXPECT_EQ(0, tv.tv_sec);
EXPECT_EQ(123, tv.tv_usec);
}
TEST(Conv, stdChronoToTimevalOverflow) {
// time_t max is 9223372036854775807
// converting it to a float or a double overflows to 9223372036854775808.0
EXPECT_THROW(
to<struct timeval>(duration<double>{9223372036854775808.}),
std::range_error);
EXPECT_THROW(
to<struct timeval>(duration<float>{9223372036854775808.f}),
std::range_error);
// Try the next float smaller than int64_t lowest
EXPECT_THROW(
to<struct timeval>(duration<double>{-9223372036854777856.}),
std::range_error);
// Try the next double smaller than int64_t lowest
EXPECT_THROW(
to<struct timeval>(duration<float>{-9223373136366403584.f}),
std::range_error);
// Test integrals with a larger range than time_t
EXPECT_THROW(
to<struct timeval>(duration<unsigned long>{9223372036854775808ULL}),
std::range_error);
#if FOLLY_HAVE_INT128_T
EXPECT_THROW(
to<struct timeval>(duration<folly::uint128_t>{9223372036854775808ULL}),
std::range_error);
EXPECT_THROW(
to<struct timeval>(duration<folly::uint128_t>{
std::numeric_limits<folly::uint128_t>::max()}),
std::range_error);
EXPECT_THROW(
to<struct timeval>(duration<folly::int128_t>{9223372036854775808ULL}),
std::range_error);
EXPECT_THROW(
to<struct timeval>(duration<folly::int128_t>{
std::numeric_limits<folly::int128_t>::max()}),
std::range_error);
EXPECT_THROW(
to<struct timeval>(duration<folly::int128_t>{
static_cast<folly::int128_t>(std::numeric_limits<int64_t>::min()) -
1}),
std::range_error);
#endif
}
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