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

   1 // Copyright (C) 2016-2019 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 run { target c++11 } }
  19
  20 // { dg-options "-std=gnu++17" }
  21 // { dg-do compile }
  22
  23 #include <chrono>
  24
  25 #if __cpp_lib_chrono < 201510
  26 # error "__cpp_lib_chrono < 201510"
  27 #endif
  28
  29 using namespace std::chrono_literals;
  30 using std::chrono::seconds;
  31 using std::chrono::milliseconds;
  32
  33 constexpr std::chrono::system_clock::time_point base{};
  34
  35 static_assert( std::chrono::floor<seconds>(base + 1000ms) == (base + 1s) );
  36 static_assert( std::chrono::floor<seconds>(base + 1001ms) == (base + 1s) );
  37 static_assert( std::chrono::floor<seconds>(base + 1500ms) == (base + 1s) );
  38 static_assert( std::chrono::floor<seconds>(base + 1999ms) == (base + 1s) );
  39 static_assert( std::chrono::floor<seconds>(base + 2000ms) == (base + 2s) );
  40 static_assert( std::chrono::floor<seconds>(base + 2001ms) == (base + 2s) );
  41 static_assert( std::chrono::floor<seconds>(base + 2500ms) == (base + 2s) );
  42
  43 static_assert( std::chrono::ceil<seconds>(base + 1000ms) == (base + 1s) );
  44 static_assert( std::chrono::ceil<seconds>(base + 1001ms) == (base + 2s) );
  45 static_assert( std::chrono::ceil<seconds>(base + 1500ms) == (base + 2s) );
  46 static_assert( std::chrono::ceil<seconds>(base + 1999ms) == (base + 2s) );
  47 static_assert( std::chrono::ceil<seconds>(base + 2000ms) == (base + 2s) );
  48 static_assert( std::chrono::ceil<seconds>(base + 2001ms) == (base + 3s) );
  49 static_assert( std::chrono::ceil<seconds>(base + 2500ms) == (base + 3s) );
  50
  51 static_assert( std::chrono::round<seconds>(base + 1000ms) == (base + 1s) );
  52 static_assert( std::chrono::round<seconds>(base + 1001ms) == (base + 1s) );
  53 static_assert( std::chrono::round<seconds>(base + 1499ms) == (base + 1s) );
  54 static_assert( std::chrono::round<seconds>(base + 1500ms) == (base + 2s) );
  55 static_assert( std::chrono::round<seconds>(base + 1999ms) == (base + 2s) );
  56 static_assert( std::chrono::round<seconds>(base + 2000ms) == (base + 2s) );
  57 static_assert( std::chrono::round<seconds>(base + 2001ms) == (base + 2s) );
  58 static_assert( std::chrono::round<seconds>(base + 2500ms) == (base + 2s) );
  59 static_assert( std::chrono::round<seconds>(base + 2501ms) == (base + 3s) );