libcxx/test/std/time/time.clock/time.clock.local/ostream.verify.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
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10 // UNSUPPORTED: no-localization
  11 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  12
  13 // TODO FMT This test should not require std::to_chars(floating-point)
  14 // XFAIL: availability-fp_to_chars-missing
  15
  16 // <chrono>
  17
  18 // class system_clock;
  19
  20 // template<class charT, class traits, class Duration>
  21 //   basic_ostream<charT, traits>&
  22 //     operator<<(basic_ostream<charT, traits>& os, const local_time<Duration>& tp);
  23
  24 // The function uses the system_clock which has two overloads
  25
  26 // template<class charT, class traits, class Duration>
  27 //   basic_ostream<charT, traits>&
  28 //     operator<<(basic_ostream<charT, traits>& os, const sys_time<Duration>& tp);
  29 // Constraints: treat_as_floating_point_v<typename Duration::rep> is false, and Duration{1} < days{1} is true.
  30
  31 // template<class charT, class traits>
  32 //   basic_ostream<charT, traits>&
  33 //     operator<<(basic_ostream<charT, traits>& os, const sys_days& dp);
  34
  35 // Note local_time's operator<< is specified a
  36 //   Effects: os << sys_time<Duration>{lt.time_since_epoch()};
  37 // since it uses Effects and not Effects: Equivalent to the constrains of
  38 // sys_time do not apply to this operator. This means it's not possible to use
  39 // a SFINAE test.
  40
  41 #include <chrono>
  42 #include <ratio>
  43 #include <sstream>
  44 #include <type_traits>
  45
  46 void test() {
  47   std::stringstream sstr;
  48
  49   // floating-point values
  50
  51   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  52       std::chrono::local_time<std::chrono::duration<float, std::ratio<1, 1>>>{
  53           std::chrono::duration<float, std::ratio<1, 1>>{0}};
  54
  55   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  56       std::chrono::local_time<std::chrono::duration<double, std::ratio<1, 1>>>{
  57           std::chrono::duration<double, std::ratio<1, 1>>{0}};
  58
  59   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  60       std::chrono::local_time<std::chrono::duration<long double, std::ratio<1, 1>>>{
  61           std::chrono::duration<long double, std::ratio<1, 1>>{0}};
  62
  63   // duration >= day
  64
  65   sstr << // valid since day has its own formatter
  66       std::chrono::local_days{std::chrono::days{0}};
  67
  68   using rep = std::conditional_t<std::is_same_v<std::chrono::days::rep, int>, long, int>;
  69   sstr << // a different rep does not matter,
  70       std::chrono::local_time<std::chrono::duration<rep, std::ratio<86400>>>{
  71           std::chrono::duration<rep, std::ratio<86400>>{0}};
  72
  73   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  74       std::chrono::local_time<std::chrono::duration<typename std::chrono::days::rep, std::ratio<86401>>>{
  75           std::chrono::duration<typename std::chrono::days::rep, std::ratio<86401>>{0}};
  76
  77   sstr << // These are considered days.
  78       std::chrono::local_time<std::chrono::weeks>{std::chrono::weeks{3}};
  79
  80   sstr << // These too.
  81       std::chrono::local_time<std::chrono::duration<rep, std::ratio<20 * 86400>>>{
  82           std::chrono::duration<rep, std::ratio<20 * 86400>>{0}};
  83
  84   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  85       std::chrono::local_time<std::chrono::months>{std::chrono::months{0}};
  86
  87   sstr << // expected-error@*:* {{invalid operands to binary expression}}
  88       std::chrono::local_time<std::chrono::years>{std::chrono::years{0}};
  89 }