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

   1 // Copyright (C) 2019-2024 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++20 } }
  19
  20 #include <concepts>
  21
  22 static_assert( !std::constructible_from<void> );
  23 static_assert( !std::constructible_from<void, void> );
  24 static_assert( std::constructible_from<void*, int*> );
  25 static_assert( !std::constructible_from<void*, const int*> );
  26 static_assert( std::constructible_from<const void*, const int*> );
  27 static_assert( std::constructible_from<char> );
  28 static_assert( std::constructible_from<float> );
  29 static_assert( std::constructible_from<float, float> );
  30 static_assert( std::constructible_from<float, double> );
  31 static_assert( std::constructible_from<int*> );
  32 static_assert( std::constructible_from<int*, int*> );
  33 static_assert( !std::constructible_from<int&> );
  34 static_assert( std::constructible_from<int&, int&> );
  35 static_assert( !std::constructible_from<int&&> );
  36 static_assert( std::constructible_from<int&&, int> );
  37 static_assert( !std::constructible_from<const int&> );
  38 static_assert( std::constructible_from<const int&, int> );
  39 static_assert( std::constructible_from<const int&, int&> );
  40 static_assert( std::constructible_from<const int&, const int> );
  41 static_assert( std::constructible_from<const int&, const int&> );
  42 static_assert( !std::constructible_from<const int&, int, int> );
  43 static_assert( !std::constructible_from<int[]> );
  44 static_assert( std::constructible_from<int[2]> );
  45 static_assert( !std::constructible_from<int()> );
  46 static_assert( std::constructible_from<int(*)()> );
  47 static_assert( std::constructible_from<int(*)(), std::nullptr_t> );
  48 static_assert( std::constructible_from<int(*)(), int(*)() noexcept> );
  49 static_assert( std::constructible_from<int(*)(), int(&)() noexcept> );
  50 static_assert( !std::constructible_from<int(&)()> );
  51 static_assert( std::constructible_from<int(&)(), int(&)() noexcept> );
  52
  53 enum E { };
  54 static_assert( std::constructible_from<E> );
  55 static_assert( std::constructible_from<E, E&> );
  56 enum class CE { };
  57 static_assert( std::constructible_from<CE> );
  58 static_assert( std::constructible_from<CE, CE&> );
  59 struct A { };
  60 static_assert( std::constructible_from<A> );
  61 static_assert( std::constructible_from<A, A> );
  62 static_assert( std::constructible_from<A, A&> );
  63 static_assert( std::constructible_from<A, const A&> );
  64 union B { };
  65 static_assert( std::constructible_from<B> );
  66 static_assert( std::constructible_from<B, B> );
  67 static_assert( std::constructible_from<B, B&> );
  68 static_assert( std::constructible_from<B, const B&> );
  69
  70 struct C
  71 {
  72   C(void* = nullptr) { }
  73   ~C() noexcept(false) { }
  74 };
  75 static_assert( !std::constructible_from<C> );
  76 static_assert( !std::constructible_from<C, void*> );
  77 static_assert( !std::constructible_from<C, std::nullptr_t> );
  78
  79 class D
  80 {
  81 public:
  82   D() { }
  83   D(int) { }
  84 private:
  85   ~D() { }
  86 };
  87 static_assert( !std::constructible_from<D> );
  88 static_assert( !std::constructible_from<D, int> );