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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <memory>
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// template <class T> constexpr T* to_address(T* p) noexcept;
// template <class Ptr> auto to_address(const Ptr& p) noexcept;
#include <memory>
#include <cassert>
#include "test_macros.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(); }
};
}
int n = 0;
static_assert(std::to_address(&n) == &n);
int main()
{
int i = 0;
ASSERT_NOEXCEPT(std::to_address(&i));
assert(std::to_address(&i) == &i);
P1 p1(&i);
ASSERT_NOEXCEPT(std::to_address(p1));
assert(std::to_address(p1) == &i);
P2 p2(&i);
ASSERT_NOEXCEPT(std::to_address(p2));
assert(std::to_address(p2) == &i);
P3 p3(&i);
ASSERT_NOEXCEPT(std::to_address(p3));
assert(std::to_address(p3) == &i);
P4 p4(&i);
ASSERT_NOEXCEPT(std::to_address(p4));
assert(std::to_address(p4) == &i);
}
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