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[v3] Add front / back to ext/vstring.h


Hi,

tested x86_64-linux, committed to mainline.

Paolo.

/////////////////////
2007-10-16  Paolo Carlini  <pcarlini@suse.de>

	* include/ext/vstring.h (__versa_string<>::front, 
	__versa_string<>::back): Add.
	* testsuite/ext/vstring/element_access/char/front_back.cc: New.
	* testsuite/ext/vstring/element_access/wchar_t/front_back.cc: Likewise.
Index: include/ext/vstring.h
===================================================================
--- include/ext/vstring.h	(revision 129390)
+++ include/ext/vstring.h	(working copy)
@@ -558,6 +558,40 @@
 	return this->_M_data()[__n];
       }
 
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+      /**
+       *  Returns a read/write reference to the data at the first
+       *  element of the %string.
+       */
+      reference
+      front()
+      { return *begin(); }
+
+      /**
+       *  Returns a read-only (constant) reference to the data at the first
+       *  element of the %string.
+       */
+      const_reference
+      front() const
+      { return *begin(); }
+
+      /**
+       *  Returns a read/write reference to the data at the last
+       *  element of the %string.
+       */
+      reference
+      back()
+      { return *(end() - 1); }
+
+      /**
+       *  Returns a read-only (constant) reference to the data at the
+       *  last element of the %string.
+       */
+      const_reference
+      back() const
+      { return *(end() - 1); }
+#endif
+
       // Modifiers:
       /**
        *  @brief  Append a string to this string.
Index: testsuite/ext/vstring/element_access/wchar_t/front_back.cc
===================================================================
--- testsuite/ext/vstring/element_access/wchar_t/front_back.cc	(revision 0)
+++ testsuite/ext/vstring/element_access/wchar_t/front_back.cc	(revision 0)
@@ -0,0 +1,44 @@
+// { dg-options "-std=gnu++0x" }
+
+// 2007-10-16  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2007 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+#include <ext/vstring.h>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::__wvstring str(L"ramifications");
+  const __gnu_cxx::__wvstring cstr(L"melodien");
+
+  VERIFY( str.front() == L'r' );
+  VERIFY( str.back() == L's' );
+  VERIFY( cstr.front() == L'm' );
+  VERIFY( cstr.back() == L'n' );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
Index: testsuite/ext/vstring/element_access/char/front_back.cc
===================================================================
--- testsuite/ext/vstring/element_access/char/front_back.cc	(revision 0)
+++ testsuite/ext/vstring/element_access/char/front_back.cc	(revision 0)
@@ -0,0 +1,44 @@
+// { dg-options "-std=gnu++0x" }
+
+// 2007-10-16  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2007 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+#include <ext/vstring.h>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  __gnu_cxx::__vstring str("ramifications");
+  const __gnu_cxx::__vstring cstr("melodien");
+
+  VERIFY( str.front() == 'r' );
+  VERIFY( str.back() == 's' );
+  VERIFY( cstr.front() == 'm' );
+  VERIFY( cstr.back() == 'n' );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}

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