ceph/src/boost/libs/asio/test/properties/cpp14/prefer_static.cpp

   1 //
   2 // cpp14/prefer_static.cpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <boost/asio/prefer.hpp>
  12 #include <cassert>
  13
  14 template <int>
  15 struct prop
  16 {
  17   template <typename> static constexpr bool is_applicable_property_v = true;
  18   static constexpr bool is_preferable = true;
  19   template <typename> static constexpr bool static_query_v = true;
  20   static constexpr bool value() { return true; }
  21 };
  22
  23 template <int>
  24 struct object
  25 {
  26 };
  27
  28 int main()
  29 {
  30   object<1> o1 = {};
  31   object<1> o2 = boost::asio::prefer(o1, prop<1>());
  32   object<1> o3 = boost::asio::prefer(o1, prop<1>(), prop<1>());
  33   object<1> o4 = boost::asio::prefer(o1, prop<1>(), prop<1>(), prop<1>());
  34   (void)o2;
  35   (void)o3;
  36   (void)o4;
  37
  38   const object<1> o5 = {};
  39   object<1> o6 = boost::asio::prefer(o5, prop<1>());
  40   object<1> o7 = boost::asio::prefer(o5, prop<1>(), prop<1>());
  41   object<1> o8 = boost::asio::prefer(o5, prop<1>(), prop<1>(), prop<1>());
  42   (void)o6;
  43   (void)o7;
  44   (void)o8;
  45
  46   constexpr object<1> o9 = boost::asio::prefer(object<1>(), prop<1>());
  47   constexpr object<1> o10 = boost::asio::prefer(object<1>(), prop<1>(), prop<1>());
  48   constexpr object<1> o11 = boost::asio::prefer(object<1>(), prop<1>(), prop<1>(), prop<1>());
  49   (void)o9;
  50   (void)o10;
  51   (void)o11;
  52 }