libstdc++-v3/testsuite/20_util/duration_cast/rounding.cc

   1 // Copyright (C) 2016-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++17 } }
  19 // { dg-add-options no_pch }
  20
  21 #include <chrono>
  22
  23 #if __cpp_lib_chrono < 201510
  24 # error "__cpp_lib_chrono < 201510"
  25 #endif
  26
  27 using namespace std::chrono_literals;
  28 using std::chrono::seconds;
  29
  30 using fp_seconds = std::chrono::duration<float>;
  31
  32 static_assert( std::chrono::floor<seconds>(1000ms) == 1s );
  33 static_assert( std::chrono::floor<seconds>(1001ms) == 1s );
  34 static_assert( std::chrono::floor<seconds>(1500ms) == 1s );
  35 static_assert( std::chrono::floor<seconds>(1999ms) == 1s );
  36 static_assert( std::chrono::floor<seconds>(2000ms) == 2s );
  37 static_assert( std::chrono::floor<seconds>(2001ms) == 2s );
  38 static_assert( std::chrono::floor<seconds>(2500ms) == 2s );
  39 static_assert( std::chrono::floor<fp_seconds>(500ms) == fp_seconds{0.5f} );
  40
  41 static_assert( std::chrono::ceil<seconds>(1000ms) == 1s );
  42 static_assert( std::chrono::ceil<seconds>(1001ms) == 2s );
  43 static_assert( std::chrono::ceil<seconds>(1500ms) == 2s );
  44 static_assert( std::chrono::ceil<seconds>(1999ms) == 2s );
  45 static_assert( std::chrono::ceil<seconds>(2000ms) == 2s );
  46 static_assert( std::chrono::ceil<seconds>(2001ms) == 3s );
  47 static_assert( std::chrono::ceil<seconds>(2500ms) == 3s );
  48 static_assert( std::chrono::ceil<fp_seconds>(500ms) == fp_seconds{0.5f} );
  49
  50 static_assert( std::chrono::round<seconds>(1000ms) == 1s );
  51 static_assert( std::chrono::round<seconds>(1001ms) == 1s );
  52 static_assert( std::chrono::round<seconds>(1499ms) == 1s );
  53 static_assert( std::chrono::round<seconds>(1500ms) == 2s );
  54 static_assert( std::chrono::round<seconds>(1999ms) == 2s );
  55 static_assert( std::chrono::round<seconds>(2000ms) == 2s );
  56 static_assert( std::chrono::round<seconds>(2001ms) == 2s );
  57 static_assert( std::chrono::round<seconds>(2500ms) == 2s );
  58 static_assert( std::chrono::round<seconds>(2501ms) == 3s );
  59
  60 static_assert( std::chrono::abs(100ms) == 100ms );
  61 static_assert( std::chrono::abs(-100ms) == 100ms );
  62
  63 // LWG 3741. std::chrono::abs(duration) is ill-formed with non-reduced periods
  64 using D1000 = std::chrono::duration<int, std::ratio<1000, 1000>>;
  65 static_assert( std::chrono::abs(D1000(-2)) == D1000(2) );
  66 static_assert( std::is_same_v<decltype(std::chrono::abs(D1000(-2))), D1000> );