86 lines
3.7 KiB
C++
86 lines
3.7 KiB
C++
// Copyright (C) 2019-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// { dg-options "-std=gnu++2a" }
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// { dg-do compile { target c++2a } }
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#include <concepts>
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static_assert( !std::assignable_from<void, void> );
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static_assert( !std::assignable_from<void*, int*> );
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static_assert( std::assignable_from<void*&, int*> );
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static_assert( !std::assignable_from<void*&, const int*> );
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static_assert( std::assignable_from<const void*&, const int*> );
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static_assert( !std::assignable_from<char, char> );
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static_assert( std::assignable_from<char&, char> );
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static_assert( !std::assignable_from<float, float> );
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static_assert( std::assignable_from<float&, double> );
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static_assert( std::assignable_from<int*&, int*> );
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static_assert( std::assignable_from<int&, int&> );
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static_assert( std::assignable_from<int&, int&&> );
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static_assert( !std::assignable_from<int&&, int> );
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static_assert( !std::assignable_from<const int&, int> );
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static_assert( !std::assignable_from<const int&, int&> );
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static_assert( !std::assignable_from<const int&, const int> );
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static_assert( !std::assignable_from<const int&, const int&> );
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static_assert( !std::assignable_from<int(&)[], int(&)[]> );
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static_assert( !std::assignable_from<int(&)[], int> );
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static_assert( !std::assignable_from<int(&)[2], int(&)[2]> );
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static_assert( !std::assignable_from<int(), int()> );
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static_assert( !std::assignable_from<int(*)(), int(*)()> );
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static_assert( std::assignable_from<int(*&)(), int(*)()> );
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static_assert( std::assignable_from<int(*&)(), std::nullptr_t> );
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static_assert( std::assignable_from<int(*&)(), int(*)() noexcept> );
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static_assert( std::assignable_from<int(*&)(), int(&)() noexcept> );
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static_assert( !std::assignable_from<int(&)(), std::nullptr_t> );
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static_assert( !std::assignable_from<int(&)(), int(&)() noexcept> );
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enum E { };
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static_assert( !std::assignable_from<E, E> );
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static_assert( std::assignable_from<E&, E> );
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static_assert( std::assignable_from<E&, E&> );
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static_assert( std::assignable_from<E&, const E&> );
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static_assert( !std::assignable_from<const E&, const E&> );
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enum class CE { };
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static_assert( !std::assignable_from<CE, CE> );
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static_assert( std::assignable_from<CE&, CE&> );
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static_assert( std::assignable_from<CE&, const CE&> );
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static_assert( !std::assignable_from<const CE&, const CE&> );
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struct A { };
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static_assert( !std::assignable_from<A, A> );
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static_assert( std::assignable_from<A&, A> );
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static_assert( !std::assignable_from<A, A&> );
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static_assert( std::assignable_from<A&, const A&> );
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union B { };
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static_assert( !std::assignable_from<B, B> );
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static_assert( std::assignable_from<B&, B> );
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static_assert( !std::assignable_from<B, B&> );
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static_assert( std::assignable_from<B&, const B&> );
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struct C
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{
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C(int) { }
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C& operator=(const C&) { return *this; }
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C& operator=(int) { return *this; }
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void operator=(void*) { }
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};
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static_assert( std::assignable_from<C&, C> );
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static_assert( std::assignable_from<C&, const C&> );
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static_assert( std::assignable_from<C&, int> );
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static_assert( !std::assignable_from<C&, void*> );
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static_assert( !std::assignable_from<C&, std::nullptr_t> );
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