libcxx/test/std/time/time.hms/time.hms.members/subseconds.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9 // <chrono>
  10
  11 // template <class Duration>
  12 // class hh_mm_ss
  13 //
  14 // constexpr precision subseconds() const noexcept;
  15 //
  16 // See the table in hours.pass.cpp for correspondence between the magic values used below
  17
  18 #include <chrono>
  19 #include <cassert>
  20 #include <cstdint>
  21 #include <ratio>
  22 #include <utility>
  23
  24 #include "test_macros.h"
  25
  26 template <typename Duration>
  27 constexpr std::int64_t check_subseconds(Duration d)
  28 {
  29     using HMS = std::chrono::hh_mm_ss<Duration>;
  30     ASSERT_SAME_TYPE(typename HMS::precision, decltype(std::declval<HMS>().subseconds()));
  31     ASSERT_NOEXCEPT(                                   std::declval<HMS>().subseconds());
  32     return HMS(d).subseconds().count();
  33 }
  34
  35 int main(int, char**)
  36 {
  37     using microfortnights = std::chrono::duration<int, std::ratio<756, 625>>;
  38
  39     static_assert( check_subseconds(std::chrono::seconds( 1)) == 0, "");
  40     static_assert( check_subseconds(std::chrono::seconds(-1)) == 0, "");
  41
  42     assert( check_subseconds(std::chrono::seconds( 5000)) == 0);
  43     assert( check_subseconds(std::chrono::seconds(-5000)) == 0);
  44     assert( check_subseconds(std::chrono::minutes( 5000)) == 0);
  45     assert( check_subseconds(std::chrono::minutes(-5000)) == 0);
  46     assert( check_subseconds(std::chrono::hours( 11))     == 0);
  47     assert( check_subseconds(std::chrono::hours(-11))     == 0);
  48
  49     assert( check_subseconds(std::chrono::milliseconds( 123456789LL)) == 789);
  50     assert( check_subseconds(std::chrono::milliseconds(-123456789LL)) == 789);
  51     assert( check_subseconds(std::chrono::microseconds( 123456789LL)) == 456789LL);
  52     assert( check_subseconds(std::chrono::microseconds(-123456789LL)) == 456789LL);
  53     assert( check_subseconds(std::chrono::nanoseconds( 123456789LL))  == 123456789LL);
  54     assert( check_subseconds(std::chrono::nanoseconds(-123456789LL))  == 123456789LL);
  55
  56     assert( check_subseconds(microfortnights(  1000)) == 6000);
  57     assert( check_subseconds(microfortnights( -1000)) == 6000);
  58     assert( check_subseconds(microfortnights( 10000)) == 0);
  59     assert( check_subseconds(microfortnights(-10000)) == 0);
  60
  61     return 0;
  62 }