From e2b58d1eea2aaeea43ddfc264a040cb16a84a37f Mon Sep 17 00:00:00 2001
From: Thomas Witt <witt@acm.org>
Date: Fri, 30 May 2003 14:57:41 +0000
Subject: [PATCH] Added test for constant iterator idiom.

[SVN r1295]
---
 test/iterator_adaptor_test.cpp | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/test/iterator_adaptor_test.cpp b/test/iterator_adaptor_test.cpp
index 727f12b..6e71714 100644
--- a/test/iterator_adaptor_test.cpp
+++ b/test/iterator_adaptor_test.cpp
@@ -155,6 +155,19 @@ public:
   in_iterator(boost::input_iterator_archetype<T> d) : super_t(d) { }
 };
 
+template <class Iter>
+struct constant_iterator
+  : boost::iterator_adaptor<
+        constant_iterator<Iter>
+      , Iter
+      , typename std::iterator_traits<Iter>::value_type const
+    >
+{
+  constant_iterator() {}
+  constant_iterator(Iter it)
+    : constant_iterator::iterator_adaptor(it) {}
+};
+
 int
 main()
 {
@@ -194,7 +207,6 @@ main()
     typedef ptr_iterator<int const> Iter1;
     BOOST_STATIC_ASSERT((boost::is_same<Iter1::value_type, int>::value));
     BOOST_STATIC_ASSERT((boost::is_same<Iter1::reference, const int&>::value));
-
     BOOST_STATIC_ASSERT((boost::is_same<Iter1::iterator_category::returns, boost::readable_lvalue_iterator_tag>::value));
 
 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
@@ -202,6 +214,19 @@ main()
     BOOST_STATIC_ASSERT((boost::is_same<Iter1::pointer, const int*>::value));
 #endif 
   }
+
+  {
+    // Test constant iterator idiom
+    typedef ptr_iterator<int> BaseIter;
+    typedef constant_iterator<BaseIter> Iter;
+
+    BOOST_STATIC_ASSERT((boost::is_same<Iter::value_type, int>::value));
+    BOOST_STATIC_ASSERT((boost::is_same<Iter::reference, int const&>::value));
+    BOOST_STATIC_ASSERT((boost::is_same<Iter::pointer, int const*>::value));
+
+    BOOST_STATIC_ASSERT((boost::is_same<BaseIter::iterator_category::returns, boost::writable_lvalue_iterator_tag>::value));
+    BOOST_STATIC_ASSERT((boost::is_same<Iter::iterator_category::returns, boost::readable_lvalue_iterator_tag>::value));
+  }
   
   // Test the iterator_adaptor
   {