Refactor path construction from null terminated iterator ranges

Move duplicated code to new _S_string_from_iter function and fix
constraints to accept iterators with const value type.

	* include/bits/fs_path.h (path::__is_encoded_char): Change from class
	template to alias template.
	(path::__value_type_is_char): Use remove_const_t.
	(path:_S_string_from_iter): New helper function.
	(path::_S_convert(InputIter, __null_terminated))
	(path::_S_convert_loc(InputIter, __null_terminated, const locale&)):
	Use _S_string_from_iter.
	(path::string<_CharT, _Allocator>(const _Allocator&)): Allow sharing
	rep for COW strings.
	* include/experimental/bits/fs_path.h (path::__is_encoded_char):
	Change from class template to alias template.
	(path::__value_type_is_char): Use remove_const.
	(path:_S_string_from_iter): New helper function.
	(path::_S_convert(InputIter, __null_terminated))
	(path::_S_convert_loc(InputIter, __null_terminated, const locale&)):
	Use _S_string_from_iter.
	* testsuite/27_io/filesystem/path/append/source.cc: Test appending
	wide strings.
	* testsuite/27_io/filesystem/path/concat/strings.cc: Check for exact
	string equality, not path equivalence.
	* testsuite/27_io/filesystem/path/construct/format.cc: Check
	construction from std::string and std::wstring and input iterators.
	* testsuite/27_io/filesystem/path/construct/locale.cc: Check
	construction from iterators.
	* testsuite/experimental/filesystem/path/concat/strings.cc: Check for
	exact string equality, not path equivalence.
	* testsuite/experimental/filesystem/path/construct/locale.cc: Check
	construction from iterators.

From-SVN: r260628

libstdc++-v3/ChangeLog

@@ -1,5 +1,34 @@
 2018-05-23  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/fs_path.h (path::__is_encoded_char): Change from class
+	template to alias template.
+	(path::__value_type_is_char): Use remove_const_t.
+	(path:_S_string_from_iter): New helper function.
+	(path::_S_convert(InputIter, __null_terminated))
+	(path::_S_convert_loc(InputIter, __null_terminated, const locale&)):
+	Use _S_string_from_iter.
+	(path::string<_CharT, _Allocator>(const _Allocator&)): Allow sharing
+	rep for COW strings.
+	* include/experimental/bits/fs_path.h (path::__is_encoded_char):
+	Change from class template to alias template.
+	(path::__value_type_is_char): Use remove_const.
+	(path:_S_string_from_iter): New helper function.
+	(path::_S_convert(InputIter, __null_terminated))
+	(path::_S_convert_loc(InputIter, __null_terminated, const locale&)):
+	Use _S_string_from_iter.
+	* testsuite/27_io/filesystem/path/append/source.cc: Test appending
+	wide strings.
+	* testsuite/27_io/filesystem/path/concat/strings.cc: Check for exact
+	string equality, not path equivalence.
+	* testsuite/27_io/filesystem/path/construct/format.cc: Check
+	construction from std::string and std::wstring and input iterators.
+	* testsuite/27_io/filesystem/path/construct/locale.cc: Check
+	construction from iterators.
+	* testsuite/experimental/filesystem/path/concat/strings.cc: Check for
+	exact string equality, not path equivalence.
+	* testsuite/experimental/filesystem/path/construct/locale.cc: Check
+	construction from iterators.
+
 	* include/bits/fs_path.h (path::_M_type): Change default member
 	initializer to _Filename.
 	(path::begin): Create past-the-end iterator for empty path.

libstdc++-v3/include/bits/fs_path.h

@@ -65,8 +65,10 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
   /// A filesystem path.
   class path
   {
-    template<typename _CharT>
+    template<typename _CharT, typename _Ch = remove_const_t<_CharT>>
-      struct __is_encoded_char : std::false_type { };
+      using __is_encoded_char
+	= __or_<is_same<_Ch, char>, is_same<_Ch, wchar_t>,
+		is_same<_Ch, char16_t>, is_same<_Ch, char32_t>>;
 
     template<typename _Iter,
 	     typename _Iter_traits = std::iterator_traits<_Iter>>
@@ -144,7 +146,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
 	     typename _Iter = decltype(_S_range_begin(std::declval<_Tp>())),
 	     typename _Val = typename std::iterator_traits<_Iter>::value_type>
       using __value_type_is_char
-	= typename std::enable_if<std::is_same<_Val, char>::value>::type;
+	= std::enable_if_t<std::is_same_v<std::remove_const_t<_Val>, char>>;
 
   public:
 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
@@ -391,6 +393,20 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     iterator begin() const;
     iterator end() const;
 
+    // Create a basic_string by reading until a null character.
+    template<typename _InputIterator,
+	     typename _Traits = std::iterator_traits<_InputIterator>,
+	     typename _CharT
+	       = typename std::remove_cv_t<typename _Traits::value_type>>
+      static std::basic_string<_CharT>
+      _S_string_from_iter(_InputIterator __source)
+      {
+	std::basic_string<_CharT> __str;
+	for (_CharT __ch = *__source; __ch != _CharT(); __ch = *++__source)
+	  __str.push_back(__ch);
+	return __str;
+      }
+
   private:
     enum class _Type : unsigned char {
 	_Multi, _Root_name, _Root_dir, _Filename
@@ -443,11 +459,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       static string_type
       _S_convert(_InputIterator __src, __null_terminated)
       {
-	using _Tp = typename std::iterator_traits<_InputIterator>::value_type;
+	auto __s = _S_string_from_iter(__src);
-	std::basic_string<typename remove_cv<_Tp>::type> __tmp;
+	return _S_convert(__s.c_str(), __s.c_str() + __s.size());
-	for (; *__src != _Tp{}; ++__src)
-	  __tmp.push_back(*__src);
-	return _S_convert(__tmp.c_str(), __tmp.c_str() + __tmp.size());
       }
 
     static string_type
@@ -467,10 +480,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _S_convert_loc(_InputIterator __src, __null_terminated,
 		     const std::locale& __loc)
       {
-	std::string __tmp;
+	std::string __s = _S_string_from_iter(__src);
-	while (*__src != '\0')
+	return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
-	  __tmp.push_back(*__src++);
-	return _S_convert_loc(__tmp.data(), __tmp.data()+__tmp.size(), __loc);
       }
 
     template<typename _CharT, typename _Traits, typename _Allocator>
@@ -500,25 +511,6 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     _Type _M_type = _Type::_Filename;
   };
 
-  template<>
-    struct path::__is_encoded_char<char> : std::true_type
-    { using value_type = char; };
-
-  template<>
-    struct path::__is_encoded_char<wchar_t> : std::true_type
-    { using value_type = wchar_t; };
-
-  template<>
-    struct path::__is_encoded_char<char16_t> : std::true_type
-    { using value_type = char16_t; };
-
-  template<>
-    struct path::__is_encoded_char<char32_t> : std::true_type
-    { using value_type = char32_t; };
-
-  template<typename _Tp>
-    struct path::__is_encoded_char<const _Tp> : __is_encoded_char<_Tp> { };
-
   inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
 
   size_t hash_value(const path& __p) noexcept;
@@ -915,11 +907,16 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     path::string(const _Allocator& __a) const
     {
       if constexpr (is_same_v<_CharT, value_type>)
+	{
 #if _GLIBCXX_USE_CXX11_ABI
 	  return { _M_pathname, __a };
 #else
+	  if constexpr (is_same_v<_Allocator, string_type::allocator_type>)
+	    return _M_pathname;
+	  else
 	    return { _M_pathname, string_type::size_type(0), __a };
 #endif
+	}
       else
 	return _S_str_convert<_CharT, _Traits>(_M_pathname, __a);
     }

libstdc++-v3/include/experimental/bits/fs_path.h

@@ -79,8 +79,11 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
   /// A filesystem path.
   class path
   {
-    template<typename _CharT>
+    template<typename _CharT,
-      struct __is_encoded_char : std::false_type { };
+	     typename _Ch = typename remove_const<_CharT>::type>
+      using __is_encoded_char
+	= __or_<is_same<_Ch, char>, is_same<_Ch, wchar_t>,
+		is_same<_Ch, char16_t>, is_same<_Ch, char32_t>>;
 
     template<typename _Iter,
 	     typename _Iter_traits = std::iterator_traits<_Iter>>
@@ -161,8 +164,9 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     template<typename _Tp,
 	     typename _Iter = decltype(_S_range_begin(std::declval<_Tp>())),
 	     typename _Val = typename std::iterator_traits<_Iter>::value_type>
-      using __value_type_is_char
+      using __value_type_is_char = typename std::enable_if<
-	= typename std::enable_if<std::is_same<_Val, char>::value>::type;
+	std::is_same<typename std::remove_const<_Val>::type, char>::value
+	>::type;
 
   public:
 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
@@ -378,6 +382,20 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     iterator begin() const;
     iterator end() const;
 
+    // Create a basic_string by reading until a null character.
+    template<typename _InputIterator,
+	     typename _Traits = std::iterator_traits<_InputIterator>,
+	     typename _CharT
+	       = typename std::remove_cv<typename _Traits::value_type>::type>
+      static std::basic_string<_CharT>
+      _S_string_from_iter(_InputIterator __source)
+      {
+	std::basic_string<_CharT> __str;
+	for (_CharT __ch = *__source; __ch != _CharT(); __ch = *++__source)
+	  __str.push_back(__ch);
+	return __str;
+      }
+
   private:
     enum class _Type : unsigned char {
 	_Multi, _Root_name, _Root_dir, _Filename
@@ -427,11 +445,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       static string_type
       _S_convert(_InputIterator __src, __null_terminated)
       {
-	using _Tp = typename std::iterator_traits<_InputIterator>::value_type;
+	auto __s = _S_string_from_iter(__src);
-	std::basic_string<typename remove_cv<_Tp>::type> __tmp;
+	return _S_convert(__s.c_str(), __s.c_str() + __s.size());
-	for (; *__src != _Tp{}; ++__src)
-	  __tmp.push_back(*__src);
-	return _S_convert(__tmp.c_str(), __tmp.c_str() + __tmp.size());
       }
 
     static string_type
@@ -451,10 +466,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _S_convert_loc(_InputIterator __src, __null_terminated,
 		     const std::locale& __loc)
       {
-	std::string __tmp;
+	std::string __s = _S_string_from_iter(__src);
-	while (*__src != '\0')
+	return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
-	  __tmp.push_back(*__src++);
-	return _S_convert_loc(__tmp.data(), __tmp.data()+__tmp.size(), __loc);
       }
 
     bool _S_is_dir_sep(value_type __ch)
@@ -594,25 +607,6 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     std::string _M_what = _M_gen_what();
   };
 
-  template<>
-    struct path::__is_encoded_char<char> : std::true_type
-    { using value_type = char; };
-
-  template<>
-    struct path::__is_encoded_char<wchar_t> : std::true_type
-    { using value_type = wchar_t; };
-
-  template<>
-    struct path::__is_encoded_char<char16_t> : std::true_type
-    { using value_type = char16_t; };
-
-  template<>
-    struct path::__is_encoded_char<char32_t> : std::true_type
-    { using value_type = char32_t; };
-
-  template<typename _Tp>
-    struct path::__is_encoded_char<const _Tp> : __is_encoded_char<_Tp> { };
-
   struct path::_Cmpt : path
   {
     _Cmpt(string_type __s, _Type __t, size_t __pos)

libstdc++-v3/testsuite/27_io/filesystem/path/append/source.cc

@@ -36,7 +36,8 @@ using __gnu_test::compare_paths;
 // path::append(InputIterator first, InputIterator last)
 // Equivalent to: return operator/=(path(first, last));
 
-void test(const path& p, std::string_view s)
+template<typename Char>
+void test(const path& p, const Char* s)
 {
   path expected = p;
   expected /= path(s);
@@ -47,8 +48,8 @@ void test(const path& p, std::string_view s)
   path func = p;
   func.append(s);
 
-  __gnu_test::test_container<const char, __gnu_test::input_iterator_wrapper>
+  __gnu_test::test_container<const Char, __gnu_test::input_iterator_wrapper>
-    input_range(s.begin(), s.end());
+    input_range(s, s + std::char_traits<Char>::length(s));
   path range = p;
   range.append(input_range.begin(), input_range.end());
 
@@ -94,7 +95,21 @@ test03()
 {
   for (const path& p : __gnu_test::test_paths)
     for (const path& q : __gnu_test::test_paths)
-      test(p, q.native());
+    {
+      test(p, q.c_str());
+      if constexpr (!std::is_same_v<path::value_type, char>)
+	test(p, q.string().c_str());
+    }
+}
+
+void
+test04()
+{
+#ifdef _GLIBCXX_USE_WCHAR_T
+  test(  "foo", L"/bar" );
+  test( L"foo",  "/bar" );
+  test( L"foo", L"/bar" );
+#endif
 }
 
 int
@@ -103,4 +118,5 @@ main()
   test01();
   test02();
   test03();
+  test04();
 }

libstdc++-v3/testsuite/27_io/filesystem/path/concat/strings.cc

@@ -23,6 +23,7 @@
 
 #include <filesystem>
 #include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
 
 using std::filesystem::path;
 
@@ -30,23 +31,30 @@ void
 test01()
 {
   path p("/");
-  p += path::string_type("foo");
+  p += "foo";
-  VERIFY( p.filename() == "foo" );
+  VERIFY( p.filename().string() == "foo" );
   p += "bar";
-  VERIFY( p.filename() == "foobar" );
+  VERIFY( p.filename().string() == "foobar" );
   p += '/';
-  VERIFY( p.parent_path() == "/foobar" && p.filename() == "" );
+  VERIFY( p.parent_path().string() == "/foobar" );
+  VERIFY( p.filename().string() == "" );
 #if _GLIBCXX_USE_WCHAR_T
+  VERIFY( p.parent_path().wstring() == L"/foobar" );
+  VERIFY( p.filename().wstring() == L"" );
   p += L"baz.txt";
 #else
   p += "baz.txt";
 #endif
-  VERIFY( p.filename() == "baz.txt" );
+  VERIFY( p.filename().string() == "baz.txt" );
   p.concat("/dir/");
-  VERIFY( p.parent_path() == "/foobar/baz.txt/dir" && p.filename() == "" );
+  // N.B. on Windows p.parent_path() is "/foobar\\baz.txt\\dir"
-  std::string file = "file";
+  VERIFY( p.parent_path() == path("/foobar/baz.txt/dir")  );
-  p.concat(file.begin(), file.end());
+  VERIFY( p.filename().string() == "" );
-  VERIFY( p.filename() == "file" );
+  const char file[] = "file";
+  __gnu_test::test_container<const char, __gnu_test::input_iterator_wrapper>
+    input(file, file + 4);
+  p.concat(input.begin(), input.end());
+  VERIFY( p.filename().string() == file );
 }
 
 int

libstdc++-v3/testsuite/27_io/filesystem/path/construct/format.cc

@@ -20,13 +20,16 @@
 // { dg-require-filesystem-ts "" }
 
 #include <filesystem>
+#include <string.h>
 #include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
 
 using std::filesystem::path;
 
 void
 test01()
 {
+  // path(string_type&&, format)
   auto s = [&]() -> path::string_type { return "foo/bar"; };
   path p0(s());
   path p1(s(), path::auto_format);
@@ -40,6 +43,7 @@ test01()
 void
 test02()
 {
+  // path(const Source&, format)
   path::string_type s = "foo/bar";
   path p0(s);
   path p1(s, path::auto_format);
@@ -53,7 +57,8 @@ test02()
 void
 test03()
 {
-  const char* s = "foo/bar";
+  // path(const Source&, format)
+  std::string s = "foo/bar";
   path p0(s);
   path p1(s, path::auto_format);
   VERIFY( p1 == p0 );
@@ -66,19 +71,57 @@ test03()
 void
 test04()
 {
-  const char s[] = "foo/bar";
+#ifdef _GLIBCXX_USE_WCHAR_T
-  path p0(std::begin(s), std::end(s));
+  // path(const Source&, format)
-  path p1(std::begin(s), std::end(s), path::auto_format);
+  std::wstring s = L"foo/bar";
+  path p0(s);
+  path p1(s, path::auto_format);
   VERIFY( p1 == p0 );
-  path p2(std::begin(s), std::end(s), path::native_format);
+  path p2(s, path::native_format);
   VERIFY( p2 == p0 );
-  path p3(std::begin(s), std::end(s), path::generic_format);
+  path p3(s, path::generic_format);
   VERIFY( p3 == p0 );
+#endif
 }
 
 void
 test05()
 {
+  // path(const Source&, format)
+  const char* s = "foo/bar";
+  path p0(s);
+  path p1(s, path::auto_format);
+  VERIFY( p1 == p0 );
+  path p2(s, path::native_format);
+  VERIFY( p2 == p0 );
+  path p3(s, path::generic_format);
+  VERIFY( p3 == p0 );
+}
+
+void
+test06()
+{
+  // path(InputIterator, InputIterator, format)
+  const char s[] = "foo/bar";
+  using namespace __gnu_test;
+  const test_container<const char, input_iterator_wrapper> c(s, s + strlen(s));
+  auto c0 = c;
+  path p0(std::begin(c0), std::end(c0));
+  auto c1 = c;
+  path p1(std::begin(c1), std::end(c1), path::auto_format);
+  VERIFY( p1 == p0 );
+  auto c2 = c;
+  path p2(std::begin(c2), std::end(c2), path::native_format);
+  VERIFY( p2 == p0 );
+  auto c3 = c;
+  path p3(std::begin(c3), std::end(c3), path::generic_format);
+  VERIFY( p3 == p0 );
+}
+
+void
+test07()
+{
+  // path(const Source&, const locale&, format)
   const char* s = "foo/bar";
   std::locale loc;
   path p0(s, loc);
@@ -91,16 +134,23 @@ test05()
 }
 
 void
-test06()
+test08()
 {
+  // path(InputIterator, InputIterator, const locale&, format)
   const char s[] = "foo/bar";
+  using namespace __gnu_test;
+  const test_container<const char, input_iterator_wrapper> c(s, s + strlen(s));
   std::locale loc;
-  path p0(std::begin(s), std::end(s), loc);
+  auto c0 = c;
-  path p1(std::begin(s), std::end(s), loc, path::auto_format);
+  path p0(std::begin(c0), std::end(c0), loc);
+  auto c1 = c;
+  path p1(std::begin(c1), std::end(c1), loc, path::auto_format);
   VERIFY( p1 == p0 );
-  path p2(std::begin(s), std::end(s), loc, path::native_format);
+  auto c2 = c;
+  path p2(std::begin(c2), std::end(c2), loc, path::native_format);
   VERIFY( p2 == p0 );
-  path p3(std::begin(s), std::end(s), loc, path::generic_format);
+  auto c3 = c;
+  path p3(std::begin(c3), std::end(c3), loc, path::generic_format);
   VERIFY( p3 == p0 );
 }
 
@@ -113,4 +163,6 @@ main()
   test04();
   test05();
   test06();
+  test07();
+  test08();
 }

libstdc++-v3/testsuite/27_io/filesystem/path/construct/locale.cc

@@ -23,6 +23,7 @@
 
 #include <filesystem>
 #include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
 
 using std::filesystem::path;
 
@@ -33,8 +34,41 @@ test01()
   VERIFY( p.native() == "/foo/bar" );
 }
 
+void
+test02()
+{
+  using __gnu_test::test_container;
+  using __gnu_test::input_iterator_wrapper;
+  // Test with input iterators and const value_types
+
+  const std::locale loc;
+  const std::string s = "foo/bar/";
+  const path p0(s);
+
+  test_container<char, input_iterator_wrapper>
+      r1((char*)s.c_str(), (char*)s.c_str() + s.size());
+  path p1(r1.begin(), r1.end(), loc);
+  VERIFY( p1 == p0 );
+
+  test_container<char, input_iterator_wrapper>
+    r2((char*)s.c_str(), (char*)s.c_str() + s.size() + 1); // includes null-terminator
+  path p2(r2.begin(), loc);
+  VERIFY( p2 == p0 );
+
+  test_container<const char, input_iterator_wrapper>
+    r3(s.c_str(), s.c_str() + s.size());
+  path p3(r3.begin(), r3.end(), loc);
+  VERIFY( p3 == p0 );
+
+  test_container<const char, input_iterator_wrapper>
+    r4(s.c_str(), s.c_str() + s.size() + 1); // includes null-terminator
+  path p4(r4.begin(), loc);
+  VERIFY( p4 == p0 );
+}
+
 int
 main()
 {
   test01();
+  test02();
 }

libstdc++-v3/testsuite/experimental/filesystem/path/concat/strings.cc

@@ -23,6 +23,7 @@
 
 #include <experimental/filesystem>
 #include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
 
 using std::experimental::filesystem::path;
 
@@ -30,23 +31,30 @@ void
 test01()
 {
   path p("/");
-  p += path::string_type("foo");
+  p += std::string("foo");
-  VERIFY( p.filename() == "foo" );
+  VERIFY( p.filename().string() == "foo" );
   p += "bar";
-  VERIFY( p.filename() == "foobar" );
+  VERIFY( p.filename().string() == "foobar" );
   p += '/';
-  VERIFY( p.parent_path() == "/foobar" && p.filename() == "." );
+  VERIFY( p.parent_path().string() == "/foobar" );
+  VERIFY( p.filename().string() == "." );
 #if _GLIBCXX_USE_WCHAR_T
+  VERIFY( p.parent_path().wstring() == L"/foobar" );
+  VERIFY( p.filename().wstring() == L"." );
   p += L"baz.txt";
 #else
   p += "baz.txt";
 #endif
-  VERIFY( p.filename() == "baz.txt" );
+  VERIFY( p.filename().string() == "baz.txt" );
   p.concat("/dir/");
-  VERIFY( p.parent_path() == "/foobar/baz.txt/dir" && p.filename() == "." );
+  // N.B. on Windows p.parent_path() is "/foobar\\baz.txt\\dir"
-  std::string file = "file";
+  VERIFY( p.parent_path() == path("/foobar/baz.txt/dir") );
-  p.concat(file.begin(), file.end());
+  VERIFY( p.filename().string() == "." );
-  VERIFY( p.filename() == "file" );
+  const char file[] = "file";
+  __gnu_test::test_container<const char, __gnu_test::input_iterator_wrapper>
+    input(file, file + 4);
+  p.concat(input.begin(), input.end());
+  VERIFY( p.filename().string() == file );
 }
 
 int

libstdc++-v3/testsuite/experimental/filesystem/path/construct/locale.cc

@@ -23,6 +23,7 @@
 
 #include <experimental/filesystem>
 #include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
 
 using std::experimental::filesystem::path;
 
@@ -33,8 +34,41 @@ test01()
   VERIFY( p.string() == "/foo/bar" );
 }
 
+void
+test02()
+{
+  using __gnu_test::test_container;
+  using __gnu_test::input_iterator_wrapper;
+  // Test with input iterators and const value_types
+
+  const std::locale loc;
+  const std::string s = "foo/bar/";
+  const path p0(s);
+
+  test_container<char, input_iterator_wrapper>
+      r1((char*)s.c_str(), (char*)s.c_str() + s.size());
+  path p1(r1.begin(), r1.end(), loc);
+  VERIFY( p1 == p0 );
+
+  test_container<char, input_iterator_wrapper>
+    r2((char*)s.c_str(), (char*)s.c_str() + s.size() + 1); // includes null-terminator
+  path p2(r2.begin(), loc);
+  VERIFY( p2 == p0 );
+
+  test_container<const char, input_iterator_wrapper>
+    r3(s.c_str(), s.c_str() + s.size());
+  path p3(r3.begin(), r3.end(), loc);
+  VERIFY( p3 == p0 );
+
+  test_container<const char, input_iterator_wrapper>
+    r4(s.c_str(), s.c_str() + s.size() + 1); // includes null-terminator
+  path p4(r4.begin(), loc);
+  VERIFY( p4 == p0 );
+}
+
 int
 main()
 {
   test01();
+  test02();
 }