From ac6044769f2ec9ccd83fe8b85a8e058abef136b6 Mon Sep 17 00:00:00 2001
From: Glen Fernandes <glen.fernandes@gmail.com>
Date: Fri, 21 Jul 2017 06:21:50 -0400
Subject: [PATCH] Add free function to_address

---
 include/boost/core/pointer_traits.hpp | 14 ++++++
 test/Jamfile.v2                       |  1 +
 test/to_address_test.cpp              | 63 +++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 test/to_address_test.cpp

diff --git a/include/boost/core/pointer_traits.hpp b/include/boost/core/pointer_traits.hpp
index 5cce489..b604b58 100644
--- a/include/boost/core/pointer_traits.hpp
+++ b/include/boost/core/pointer_traits.hpp
@@ -239,6 +239,20 @@ struct pointer_traits<T*> {
 };
 #endif
 
+template<class T>
+inline typename pointer_traits<T>::element_type*
+to_address(const T& v) BOOST_NOEXCEPT
+{
+    return pointer_traits<T>::to_address(v);
+}
+
+template<class T>
+inline T*
+to_address(T* v) BOOST_NOEXCEPT
+{
+    return v;
+}
+
 } /* boost */
 
 #endif
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 204e79e..024fab6 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -116,6 +116,7 @@ run pointer_traits_element_type_test.cpp ;
 run pointer_traits_difference_type_test.cpp ;
 run pointer_traits_rebind_test.cpp ;
 run pointer_traits_pointer_to_test.cpp ;
+run to_address_test.cpp ;
 
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;
diff --git a/test/to_address_test.cpp b/test/to_address_test.cpp
new file mode 100644
index 0000000..a4fdfd2
--- /dev/null
+++ b/test/to_address_test.cpp
@@ -0,0 +1,63 @@
+/*
+Copyright 2017 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/core/pointer_traits.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+template<class T>
+class pointer {
+public:
+    typedef typename boost::pointer_traits<T>::element_type element_type;
+    pointer(T value)
+        : value_(value) { }
+    T operator->() const BOOST_NOEXCEPT {
+        return value_;
+    }
+private:
+    T value_;
+};
+
+int main()
+{
+    int i = 0;
+    {
+        typedef int* type;
+        type p = &i;
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef pointer<int*> type;
+        type p(&i);
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef pointer<pointer<int*> > type;
+        type p(&i);
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef void* type;
+        type p = &i;
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef pointer<void*> type;
+        type p(&i);
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef const int* type;
+        type p = &i;
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    {
+        typedef pointer<const int*> type;
+        type p(&i);
+        BOOST_TEST(boost::to_address(p) == &i);
+    }
+    return boost::report_errors();
+}