Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 98 insertions, 0 deletions

diff --git a/boost/optional/optional_io.hpp b/boost/optional/optional_io.hpp
new file mode 100644
index 0000000000..9e0c807d3e
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+++ b/boost/optional/optional_io.hpp
@@ -0,0 +1,98 @@
+// Copyright (C) 2005, Fernando Luis Cacciola Carballal.
+//
+// Use, modification, and distribution is subject to 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)
+//
+// See http://www.boost.org/libs/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  fernando_cacciola@hotmail.com
+//
+#ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
+#define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
+
+#if defined __GNUC__
+#  if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97)
+#    define BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
+#  endif
+#endif // __GNUC__
+
+#if defined BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
+#  include <iostream>
+#else
+#  include <istream>
+#  include <ostream>
+#endif
+
+#include <boost/none.hpp>
+#include <boost/assert.hpp>
+#include "boost/optional/optional.hpp"
+#include "boost/utility/value_init.hpp"
+
+namespace boost
+{
+
+#if defined (BOOST_NO_TEMPLATED_STREAMS)
+template<class T>
+inline std::ostream& operator<<(std::ostream& out, optional<T> const& v)
+#else
+template<class CharType, class CharTrait, class T>
+inline
+std::basic_ostream<CharType, CharTrait>&
+operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v)
+#endif
+{
+  if ( out.good() )
+  {
+    if ( !v )
+         out << "--" ;
+    else out << ' ' << *v ;
+  }
+
+  return out;
+}
+
+#if defined (BOOST_NO_TEMPLATED_STREAMS)
+template<class T>
+inline std::istream& operator>>(std::istream& in, optional<T>& v)
+#else
+template<class CharType, class CharTrait, class T>
+inline
+std::basic_istream<CharType, CharTrait>&
+operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)
+#endif
+{
+  if (in.good())
+  {
+    int d = in.get();
+    if (d == ' ')
+    {
+      T x;
+      in >> x;
+      v = x;
+    }
+    else
+    {
+      if (d == '-')
+      {
+        d = in.get();
+
+        if (d == '-')
+        {
+          v = none;
+          return in;
+        }
+      }
+
+      in.setstate( std::ios::failbit );
+    }
+  }
+
+  return in;
+}
+
+} // namespace boost
+
+#endif
+