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// Copyright (C) 2017-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
#include <memory>
#include <testsuite_hooks.h>
class P1
{
public:
using element_type = int;
explicit P1(int* p)
: p_(p) { }
int* operator->() const noexcept
{ return p_; }
private:
int* p_;
};
class P2
{
public:
using element_type = int;
explicit P2(int* p)
: p_(p) { }
P1 operator->() const noexcept
{ return p_; }
private:
P1 p_;
};
class P3
{
public:
explicit P3(int* p)
: p_(p) { }
int* get() const noexcept
{ return p_; }
private:
int* p_;
};
namespace std
{
template<>
struct pointer_traits<::P3>
{
static int* to_address(const ::P3& p) noexcept
{ return p.get(); }
};
}
class P4
{
public:
explicit P4(int* p)
: p_(p) { }
int* operator->() const noexcept
{ return nullptr; }
int* get() const noexcept
{ return p_; }
private:
int* p_;
};
namespace std
{
template<>
struct pointer_traits<::P4>
{
static int* to_address(const ::P4& p) noexcept
{ return p.get(); }
};
}
void test01()
{
int i = 0;
int* p = &i;
VERIFY( std::to_address(p) == &i );
}
void test02()
{
int i = 0;
P1 p(&i);
VERIFY( std::to_address(p) == &i );
}
void test03()
{
int i = 0;
P2 p(&i);
VERIFY( std::to_address(p) == &i );
}
void test04()
{
int i = 0;
P3 p(&i);
VERIFY( std::to_address(p) == &i );
}
void test05()
{
int i = 0;
P4 p(&i);
VERIFY( std::to_address(p) == &i );
}
int main()
{
test01();
test02();
test03();
test04();
test05();
return 0;
}