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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.commonref/1.cc
1 // Copyright (C) 2019-2024 Free Software Foundation, Inc.
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)
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.
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/>.
18 // { dg-do compile { target c++20 } }
22 static_assert( std::common_reference_with
<int, int> );
23 static_assert( std::common_reference_with
<int, const int> );
24 static_assert( std::common_reference_with
<int&&, const int&> );
25 static_assert( std::common_reference_with
<int&, const int&&> );
26 static_assert( ! std::common_reference_with
<int, void> );
27 static_assert( ! std::common_reference_with
<int, int*> );
28 static_assert( ! std::common_reference_with
<int, int()> );
30 struct A
{ A(int) { } };
31 static_assert( std::common_reference_with
<A
, int> );
34 static_assert( ! std::common_reference_with
<A
, B
> );
36 struct C
{ C(A
&) { } };
37 static_assert( std::common_reference_with
<A
&, C
> );
38 static_assert( std::common_reference_with
<A
&, C
&&> );
39 static_assert( std::common_reference_with
<A
&, const C
&> );
40 static_assert( std::common_reference_with
<A
&, C
&> );
41 static_assert( ! std::common_reference_with
<const A
&, C
> );
42 static_assert( ! std::common_reference_with
<const A
&, const C
&> );
45 struct E
{ E(D
&) { } };
46 struct D
{ D(E
&) { } };
47 static_assert( ! std::common_reference_with
<D
&, E
&> ); // ambiguous conversion
50 struct G
{ G(const F
&) { } };
51 struct F
{ F(const G
&) { } };
54 template<template<typename
> class Qual1
, template<typename
> class Qual2
>
55 struct basic_common_reference
<F
, G
, Qual1
, Qual2
>
56 { using type
= Qual1
<Qual2
<F
>>; };
57 template<template<typename
> class Qual1
, template<typename
> class Qual2
>
58 struct basic_common_reference
<G
, F
, Qual1
, Qual2
>
59 { using type
= Qual1
<Qual2
<F
>>; };
62 static_assert( ! std::common_reference_with
<F
&, G
&> );
63 static_assert( std::common_reference_with
<F
, G
> );
64 static_assert( std::common_reference_with
<F
, const G
> );
65 static_assert( std::common_reference_with
<const F
, const G
> );
68 struct Derived
: Base
{ };
69 static_assert( std::common_reference_with
<Derived
&, Base
&> );
70 static_assert( std::common_with
<Derived
*, Base
*> );