libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.constructible/1.cc

   1 // Copyright (C) 2019-2020 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++2a" }
  19 // { dg-do compile { target c++2a } }
  20
  21 #include <concepts>
  22
  23 static_assert( !std::constructible_from<void> );
  24 static_assert( !std::constructible_from<void, void> );
  25 static_assert( std::constructible_from<void*, int*> );
  26 static_assert( !std::constructible_from<void*, const int*> );
  27 static_assert( std::constructible_from<const void*, const int*> );
  28 static_assert( std::constructible_from<char> );
  29 static_assert( std::constructible_from<float> );
  30 static_assert( std::constructible_from<float, float> );
  31 static_assert( std::constructible_from<float, double> );
  32 static_assert( std::constructible_from<int*> );
  33 static_assert( std::constructible_from<int*, int*> );
  34 static_assert( !std::constructible_from<int&> );
  35 static_assert( std::constructible_from<int&, int&> );
  36 static_assert( !std::constructible_from<int&&> );
  37 static_assert( std::constructible_from<int&&, int> );
  38 static_assert( !std::constructible_from<const int&> );
  39 static_assert( std::constructible_from<const int&, int> );
  40 static_assert( std::constructible_from<const int&, int&> );
  41 static_assert( std::constructible_from<const int&, const int> );
  42 static_assert( std::constructible_from<const int&, const int&> );
  43 static_assert( !std::constructible_from<const int&, int, int> );
  44 static_assert( !std::constructible_from<int[]> );
  45 static_assert( std::constructible_from<int[2]> );
  46 static_assert( !std::constructible_from<int()> );
  47 static_assert( std::constructible_from<int(*)()> );
  48 static_assert( std::constructible_from<int(*)(), std::nullptr_t> );
  49 static_assert( std::constructible_from<int(*)(), int(*)() noexcept> );
  50 static_assert( std::constructible_from<int(*)(), int(&)() noexcept> );
  51 static_assert( !std::constructible_from<int(&)()> );
  52 static_assert( std::constructible_from<int(&)(), int(&)() noexcept> );
  53
  54 enum E { };
  55 static_assert( std::constructible_from<E> );
  56 static_assert( std::constructible_from<E, E&> );
  57 enum class CE { };
  58 static_assert( std::constructible_from<CE> );
  59 static_assert( std::constructible_from<CE, CE&> );
  60 struct A { };
  61 static_assert( std::constructible_from<A> );
  62 static_assert( std::constructible_from<A, A> );
  63 static_assert( std::constructible_from<A, A&> );
  64 static_assert( std::constructible_from<A, const A&> );
  65 union B { };
  66 static_assert( std::constructible_from<B> );
  67 static_assert( std::constructible_from<B, B> );
  68 static_assert( std::constructible_from<B, B&> );
  69 static_assert( std::constructible_from<B, const B&> );
  70
  71 struct C
  72 {
  73   C(void* = nullptr) { }
  74   ~C() noexcept(false) { }
  75 };
  76 static_assert( !std::constructible_from<C> );
  77 static_assert( !std::constructible_from<C, void*> );
  78 static_assert( !std::constructible_from<C, std::nullptr_t> );
  79
  80 class D
  81 {
  82 public:
  83   D() { }
  84   D(int) { }
  85 private:
  86   ~D() { }
  87 };
  88 static_assert( !std::constructible_from<D> );
  89 static_assert( !std::constructible_from<D, int> );