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Add free function to_address

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This commit is contained in:
Glen Fernandes
2017-07-21 07:14:02 -04:00
parent 526e0b2f53
commit 09f4823baa
2 changed files with 71 additions and 3 deletions
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6
include/boost/core/pointer_traits.hpp
View File

@ -24,7 +24,7 @@ namespace detail {
template<class U> template<class U>
inline typename boost::pointer_traits<U>::element_type* inline typename boost::pointer_traits<U>::element_type*
ptr_traits_address(U v) BOOST_NOEXCEPT ptr_traits_address(const U& v) BOOST_NOEXCEPT
{ {
return boost::pointer_traits<U>::to_address(v); return boost::pointer_traits<U>::to_address(v);
} }
@ -40,7 +40,7 @@ struct pointer_traits
typedef typename std::pointer_traits<T>::template rebind<U> type; typedef typename std::pointer_traits<T>::template rebind<U> type;
}; };
static typename std::pointer_traits<T>::element_type* static typename std::pointer_traits<T>::element_type*
to_address(T v) BOOST_NOEXCEPT { to_address(const T& v) BOOST_NOEXCEPT {
return detail::ptr_traits_address(v.operator->()); return detail::ptr_traits_address(v.operator->());
} }
}; };
@ -211,7 +211,7 @@ struct pointer_traits {
pointer_to(typename detail::ptr_traits_value<element_type>::type& v) { pointer_to(typename detail::ptr_traits_value<element_type>::type& v) {
return pointer::pointer_to(v); return pointer::pointer_to(v);
} }
static element_type* to_address(pointer v) BOOST_NOEXCEPT { static element_type* to_address(const pointer& v) BOOST_NOEXCEPT {
return detail::ptr_traits_address(v.operator->()); return detail::ptr_traits_address(v.operator->());
} }
}; };

68
test/to_address_test.cpp
View File

@ -21,6 +21,44 @@ private:
T value_; T value_;
}; };
template<class T>
class special {
public:
special(T* value)
: value_(value) { }
T* get() const BOOST_NOEXCEPT {
return value_;
}
private:
T* value_;
};
namespace boost {
template<class T>
struct pointer_traits<special<T> > {
typedef special<T> pointer;
typedef T element_type;
typedef std::ptrdiff_t difference_type;
template<class U>
struct rebind_to {
typedef special<U> type;
};
#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
template<class U>
using rebind = typename rebind_to<U>::type;
#endif
template<class U>
static pointer pointer_to(U& v) BOOST_NOEXCEPT {
return pointer(&v);
}
static element_type* to_address(const pointer& v) BOOST_NOEXCEPT {
return v.get();
}
};
} /* boost */
int main() int main()
{ {
int i = 0; int i = 0;
@ -59,5 +97,35 @@ int main()
type p(&i); type p(&i);
BOOST_TEST(boost::to_address(p) == &i); BOOST_TEST(boost::to_address(p) == &i);
} }
{
typedef special<int> type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
{
typedef special<void> type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
{
typedef special<const int> type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
{
typedef pointer<special<int> > type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
{
typedef pointer<special<void> > type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
{
typedef pointer<special<const int> > type;
type p(&i);
BOOST_TEST(boost::to_address(p) == &i);
}
return boost::report_errors(); return boost::report_errors();
} }