libstdc++-v3/testsuite/20_util/tuple/make_from_tuple/2.cc

   1 // Copyright (C) 2019-2022 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
  20 // Test noexcept-specifier on std::make_from_tuple
  21
  22 #include <tuple>
  23
  24 using std::make_from_tuple;
  25 using std::tuple;
  26 using std::declval;
  27
  28 struct T1 { T1(); };
  29
  30 static_assert( !noexcept(make_from_tuple<T1>(declval<tuple<>>())) );
  31 static_assert( !noexcept(make_from_tuple<T1>(declval<tuple<>&>())) );
  32 static_assert( !noexcept(make_from_tuple<T1>(declval<const tuple<>>())) );
  33 static_assert( !noexcept(make_from_tuple<T1>(declval<const tuple<>&>())) );
  34
  35 struct T2 { };
  36
  37 static_assert( noexcept(make_from_tuple<T2>(declval<tuple<>>())) );
  38 static_assert( noexcept(make_from_tuple<T2>(declval<tuple<>&>())) );
  39 static_assert( noexcept(make_from_tuple<T2>(declval<const tuple<>>())) );
  40 static_assert( noexcept(make_from_tuple<T2>(declval<const tuple<>&>())) );
  41
  42 struct T3 {
  43   T3(int&);
  44   T3(int&&) noexcept;
  45   T3(const int&) noexcept;
  46   T3(const int&&);
  47 };
  48
  49 static_assert( noexcept(make_from_tuple<T3>(declval<tuple<int>>())) );
  50 static_assert( !noexcept(make_from_tuple<T3>(declval<tuple<int>&>())) );
  51 static_assert( !noexcept(make_from_tuple<T3>(declval<const tuple<int>>())) );
  52 static_assert( noexcept(make_from_tuple<T3>(declval<const tuple<int>&>())) );
  53
  54 struct T4 {
  55   T4(int&, const int&);
  56   T4(int&&, int&&) noexcept;
  57 };
  58
  59 static_assert( noexcept(make_from_tuple<T4>(declval<tuple<int, int>>())) );
  60 static_assert( !noexcept(make_from_tuple<T4>(declval<tuple<int, int>&>())) );
  61 static_assert( !noexcept(make_from_tuple<T4>(declval<tuple<int&, const int>>())) );
  62 static_assert( !noexcept(make_from_tuple<T4>(declval<tuple<int, const int>&>())) );