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1 // Copyright (C) 2020 Free Software Foundation, Inc.
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2 //
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3 // This file is part of the GNU ISO C++ Library. This library is free
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4 // software; you can redistribute it and/or modify it under the
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5 // terms of the GNU General Public License as published by the
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6 // Free Software Foundation; either version 3, or (at your option)
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7 // any later version.
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8
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9 // This library is distributed in the hope that it will be useful,
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10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 // GNU General Public License for more details.
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13
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14 // You should have received a copy of the GNU General Public License along
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15 // with this library; see the file COPYING3. If not see
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16 // <http://www.gnu.org/licenses/>.
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17
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18 // { dg-options "-std=gnu++2a" }
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19 // { dg-do compile { target c++2a } }
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20
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21 #include <chrono>
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22
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23 using std::chrono::file_clock;
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24
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25 // Cpp17Clock requirements:
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26
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27 // New type so that is_clock<file_clock> specialization isn't used.
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28 struct C : file_clock { };
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29 static_assert( std::chrono::is_clock_v<C> );
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30
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31 // Cpp17TrivialClock requirements:
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32
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33 // A trivial clock's rep must be a numeric type, which is true for
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34 // libstdc++ because we use an integral type.
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35 static_assert( std::is_integral_v<file_clock::rep> );
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36
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37 // We meet the recursive Cpp17TrivialClock requirement by using the same clock:
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38 static_assert( std::is_same_v<file_clock::time_point::clock, file_clock> );
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39
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40 // chrono::file_clock requirements:
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41
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42 static_assert( std::is_signed_v<file_clock::rep> );
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43 static_assert( noexcept(file_clock::now()) );
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