From d5b67c7fab505e7fffb6288d082eb4b317880aa6 Mon Sep 17 00:00:00 2001
From: morinmorin <mimomorin@gmail.com>
Date: Thu, 29 Jun 2017 22:09:26 +0900
Subject: [PATCH] Add tests for boost::advance/distance

---
 test/advance_test.cpp  | 65 ++++++++++++++++++++++++++++++++++++++++++
 test/distance_test.cpp | 63 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+)
 create mode 100644 test/advance_test.cpp
 create mode 100644 test/distance_test.cpp

diff --git a/test/advance_test.cpp b/test/advance_test.cpp
new file mode 100644
index 0000000..230d07e
--- /dev/null
+++ b/test/advance_test.cpp
@@ -0,0 +1,65 @@
+// Copyright (C) 2017 Michel Morin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <vector>
+#include <list>
+#include <boost/container/slist.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/iterator/advance.hpp>
+#include <boost/iterator/transform_iterator.hpp>
+
+int twice(int x) { return x + x; }
+
+template <typename Iterator>
+void test_advance(Iterator it_from, Iterator it_to, int n)
+{
+    boost::advance(it_from,  n);
+    BOOST_TEST(it_from == it_to);
+}
+
+int main()
+{
+    int array[3] = {1, 2, 3};
+    int* ptr1 = array;
+    int* ptr2 = array + 3;
+
+    {
+        test_advance(ptr1, ptr2,  3);
+        test_advance(ptr2, ptr1, -3);
+    }
+
+    {
+        std::vector<int> ints(ptr1, ptr2);
+        test_advance(ints.begin(), ints.end(),  3);
+        test_advance(ints.end(), ints.begin(), -3);
+    }
+
+    {
+        test_advance(
+            boost::make_transform_iterator(ptr1, twice)
+          , boost::make_transform_iterator(ptr2, twice)
+          , 3
+        );
+        test_advance(
+            boost::make_transform_iterator(ptr2, twice)
+          , boost::make_transform_iterator(ptr1, twice)
+          , -3
+        );
+    }
+
+    {
+        std::list<int> ints(ptr1, ptr2);
+        test_advance(ints.begin(), ints.end(),  3);
+        test_advance(ints.end(), ints.begin(), -3);
+    }
+
+    {
+        boost::container::slist<int> ints(ptr1, ptr2);
+        test_advance(ints.begin(), ints.end(),  3);
+    }
+
+    return boost::report_errors();
+}
diff --git a/test/distance_test.cpp b/test/distance_test.cpp
new file mode 100644
index 0000000..494b0d5
--- /dev/null
+++ b/test/distance_test.cpp
@@ -0,0 +1,63 @@
+// Copyright (C) 2017 Michel Morin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <vector>
+#include <list>
+#include <boost/container/slist.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/iterator/distance.hpp>
+#include <boost/iterator/transform_iterator.hpp>
+
+int twice(int x) { return x + x; }
+
+template <typename Iterator>
+void test_distance(Iterator it_from, Iterator it_to, int n)
+{
+    BOOST_TEST(boost::distance(it_from, it_to) == n);
+}
+
+int main()
+{
+    int array[3] = {1, 2, 3};
+    int* ptr1 = array;
+    int* ptr2 = array + 3;
+
+    {
+        test_distance(ptr1, ptr2,  3);
+        test_distance(ptr2, ptr1, -3);
+    }
+
+    {
+        std::vector<int> ints(ptr1, ptr2);
+        test_distance(ints.begin(), ints.end(),  3);
+        test_distance(ints.end(), ints.begin(), -3);
+    }
+
+    {
+        test_distance(
+            boost::make_transform_iterator(ptr1, twice)
+          , boost::make_transform_iterator(ptr2, twice)
+          , 3
+        );
+        test_distance(
+            boost::make_transform_iterator(ptr2, twice)
+          , boost::make_transform_iterator(ptr1, twice)
+          , -3
+        );
+    }
+
+    {
+        std::list<int> ints(ptr1, ptr2);
+        test_distance(ints.begin(), ints.end(),  3);
+    }
+
+    {
+        boost::container::slist<int> ints(ptr1, ptr2);
+        test_distance(ints.begin(), ints.end(),  3);
+    }
+
+    return boost::report_errors();
+}