libstdc++-v3/testsuite/20_util/is_nothrow_constructible/value_c++20.cc

   1 // { dg-options "-std=gnu++2a" }
   2 // { dg-do compile { target c++2a } }
   3
   4 // Copyright (C) 2020-2021 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22
  23 static_assert( std::is_nothrow_constructible_v<int[1]> );
  24 static_assert( std::is_nothrow_constructible_v<int[1], int> );
  25 static_assert( std::is_nothrow_constructible_v<int[2], int> );
  26 static_assert( std::is_nothrow_constructible_v<int[2], int, int> );
  27 static_assert( ! std::is_nothrow_constructible_v<int[1], int, int> );
  28 static_assert( ! std::is_nothrow_constructible_v<int[]> );
  29 static_assert( ! std::is_nothrow_constructible_v<int[], int> );
  30 static_assert( ! std::is_nothrow_constructible_v<int[], int, int> );
  31
  32 struct X
  33 {
  34   X() = default;
  35   X(int) noexcept { }
  36   X(double) { }
  37 };
  38
  39 static_assert( std::is_nothrow_constructible_v<X[2]> );
  40 static_assert( std::is_nothrow_constructible_v<X[1], X> );
  41 static_assert( std::is_nothrow_constructible_v<X[1], int> );
  42 static_assert( ! std::is_nothrow_constructible_v<X[1], double> );
  43 static_assert( ! std::is_nothrow_constructible_v<X[2], int, double> );
  44
  45 struct Y
  46 {
  47   int i;
  48   X x;
  49 };
  50
  51 static_assert( std::is_nothrow_constructible_v<Y> );
  52 static_assert( std::is_nothrow_constructible_v<Y, Y> );
  53 static_assert( std::is_nothrow_constructible_v<Y, int> );
  54 static_assert( ! std::is_nothrow_constructible_v<Y, X> );
  55 static_assert( std::is_nothrow_constructible_v<Y, int, X> );
  56 static_assert( std::is_nothrow_constructible_v<Y, int, int> );
  57 static_assert( ! std::is_nothrow_constructible_v<Y, int, double> );
  58
  59 struct Z : Y { };
  60
  61 static_assert( std::is_nothrow_constructible_v<Z> );
  62 static_assert( std::is_nothrow_constructible_v<Z, Z> );
  63 static_assert( std::is_nothrow_constructible_v<Z, Y> );
  64 static_assert( ! std::is_nothrow_constructible_v<Z, int> );
  65 static_assert( ! std::is_nothrow_constructible_v<Z, int, X> );
  66 static_assert( ! std::is_nothrow_constructible_v<Z, int, int> );
  67 static_assert( ! std::is_nothrow_constructible_v<Z, Y, double> );
  68 static_assert( ! std::is_nothrow_constructible_v<Z, int, double> );
  69 static_assert( ! std::is_nothrow_constructible_v<Z, X> );