libstdc++-v3/testsuite/20_util/optional/cons/85642.cc

   1 // Copyright (C) 2018-2021 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-options "-std=gnu++17" }
  19 // { dg-do compile { target c++17 } }
  20
  21 #include <optional>
  22
  23 struct NonTrivialDtor {
  24   ~NonTrivialDtor() { }
  25 };
  26
  27 struct NonTrivialCopyAssign {
  28   NonTrivialCopyAssign& operator=(const NonTrivialCopyAssign&) { return *this; }
  29   NonTrivialCopyAssign& operator=(NonTrivialCopyAssign&&) = default;
  30 };
  31
  32 struct NonTrivialMoveAssign {
  33   NonTrivialMoveAssign& operator=(const NonTrivialMoveAssign&) = default;
  34   NonTrivialMoveAssign& operator=(NonTrivialMoveAssign&&) { return *this; }
  35 };
  36
  37 struct NonTrivialAssign {
  38   NonTrivialAssign& operator=(const NonTrivialAssign&) { return *this; }
  39   NonTrivialAssign& operator=(NonTrivialAssign&&) { return *this; }
  40 };
  41
  42 struct NonTrivialAll {
  43   ~NonTrivialAll() { }
  44   NonTrivialAll& operator=(const NonTrivialAll&) { return *this; }
  45   NonTrivialAll& operator=(NonTrivialAll&&) { return *this; }
  46 };
  47
  48 struct ConstExpr { int i = 0; };
  49
  50 struct Trivial { int i; };
  51
  52 template<typename T>
  53   constexpr bool check
  54     = std::is_nothrow_default_constructible_v<std::optional<T>>;
  55
  56 // PR libstdc++/85642
  57 static_assert(check<NonTrivialDtor>);
  58 static_assert(check<NonTrivialCopyAssign>);
  59 static_assert(check<NonTrivialMoveAssign>);
  60 static_assert(check<NonTrivialAssign>);
  61 static_assert(check<NonTrivialAll>);
  62 static_assert(check<ConstExpr>);
  63 static_assert(check<Trivial>);