Added support for regex_fwd.hpp

[SVN r13333]

include/boost/regex_fwd.hpp

@@ -0,0 +1,69 @@
+/*
+ *
+ * Copyright (c) 1998-2000
+ * Dr John Maddock
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Dr John Maddock makes no representations
+ * about the suitability of this software for any purpose.
+ * It is provided "as is" without express or implied warranty.
+ *
+ */
+
+ /*
+  *   LOCATION:    see http://www.boost.org for most recent version.
+  *   FILE         regex_fwd.cpp
+  *   VERSION      see <boost/version.hpp>
+  *   DESCRIPTION: Forward declares boost::reg_expression<> and
+  *                associated typedefs.
+  */
+
+#ifndef BOOST_REGEX_FWD_HPP
+#define BOOST_REGEX_FWD_HPP
+
+#include <boost/config.hpp>
+#include <boost/detail/allocator.hpp>
+
+//
+// define BOOST_REGEX_NO_FWD if this
+// header doesn't work!
+//
+#ifdef __CYGWIN__
+#  define BOOST_REGEX_NO_FWD
+#endif
+
+#ifdef BOOST_REGEX_NO_FWD
+#  ifndef BOOST_RE_REGEX_HPP
+#     include <boost/regex.hpp>
+#  endif
+#else
+
+//
+// If there isn't good enough wide character support then there will
+// be no wide character regular expressions:
+//
+#if (defined(BOOST_NO_CWCHAR) || defined(BOOST_NO_CWCTYPE) || defined(BOOST_NO_STD_WSTRING)) && !defined(BOOST_NO_WREGEX)
+#  define BOOST_NO_WREGEX
+#endif
+
+namespace boost{
+
+template <class charT>
+class regex_traits;
+
+template <class charT, class traits = regex_traits<charT>, class Allocator = BOOST_DEFAULT_ALLOCATOR(charT) >
+class reg_expression;
+
+typedef reg_expression<char, regex_traits<char>, BOOST_DEFAULT_ALLOCATOR(char)> regex;
+#ifndef BOOST_NO_WREGEX
+typedef reg_expression<wchar_t, regex_traits<wchar_t>, BOOST_DEFAULT_ALLOCATOR(wchar_t)> wregex;
+#endif
+
+} // namespace boost
+
+#endif  // BOOST_REGEX_NO_FWD
+
+#endif