1 files changed, 142 insertions, 0 deletions
diff --git a/boost/endian/detail/cover_operators.hpp b/boost/endian/detail/cover_operators.hpp
new file mode 100644
index 0000000000..f4fd052803
--- /dev/null
+++ b/boost/endian/detail/cover_operators.hpp
@@ -0,0 +1,142 @@
+//  boost/endian/detail/cover_operators.hpp ----------------------------------//
+
+//  Copyright Darin Adler 2000
+//  Copyright Beman Dawes 2008
+
+//  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)
+
+#ifndef BOOST_ENDIAN_COVER_OPERATORS_HPP
+#define BOOST_ENDIAN_COVER_OPERATORS_HPP
+
+#if defined(_MSC_VER)  
+# pragma warning(push)  
+# pragma warning(disable:4365)  // conversion ... signed/unsigned mismatch
+#endif
+
+# ifndef BOOST_ENDIAN_MINIMAL_COVER_OPERATORS
+#   include <boost/operators.hpp>
+# endif
+
+#include <boost/config.hpp>
+#include <iosfwd>
+
+namespace boost
+{
+  namespace endian
+  {
+
+//--------------------------------------------------------------------------------------//
+
+//  A class that adds arithmetic operators to an arithmetic cover class
+//
+//  Uses the curiously recurring template pattern (CRTP).
+//
+//  If the class being covered has a non-explicit conversion to an integer type
+//  then a smaller number of cover operations are needed. Define the macro
+//  BOOST_ENDIAN_MINIMAL_COVER_OPERATORS to indicate this.
+//
+//  Define BOOST_NO_IO_COVER_OPERATORS if I/O cover operations are not desired.
+
+//--------------------------------------------------------------------------------------//
+
+    template <class D,   // D is the CRTP derived type, i.e. the cover class
+              class ArithmeticT>
+    class cover_operators
+#    ifndef BOOST_ENDIAN_MINIMAL_COVER_OPERATORS
+      : boost::operators<D>
+#    endif
+    {
+      // The other operations take advantage of the type conversion that's
+      // built into unary +.
+
+      // Unary operations.
+      friend ArithmeticT operator+(const D& x) BOOST_NOEXCEPT { return x; }
+#   ifndef BOOST_ENDIAN_MINIMAL_COVER_OPERATORS
+      friend ArithmeticT operator-(const D& x) BOOST_NOEXCEPT { return -+x; }
+      friend ArithmeticT operator~(const D& x) BOOST_NOEXCEPT { return ~+x; }
+      friend ArithmeticT operator!(const D& x) BOOST_NOEXCEPT { return !+x; }
+
+      // The basic ordering operations.
+      friend bool operator==(const D& x, ArithmeticT y) BOOST_NOEXCEPT { return +x == y; }
+      friend bool operator<(const D& x, ArithmeticT y) BOOST_NOEXCEPT { return +x < y; }
+#   endif
+      
+      // The basic arithmetic operations.
+      friend D& operator+=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x + y); }
+      friend D& operator-=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x - y); }
+      friend D& operator*=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x * y); }
+      friend D& operator/=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x / y); }
+      friend D& operator%=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x % y); }
+      friend D& operator&=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x & y); }
+      friend D& operator|=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x | y); }
+      friend D& operator^=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x ^ y); }
+      friend D& operator<<=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x << y); }
+      friend D& operator>>=(D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return x = static_cast<ArithmeticT>(+x >> y); }
+      
+      // A few binary arithmetic operations not covered by operators base class.
+      friend ArithmeticT operator<<(const D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return static_cast<ArithmeticT>(+x << y); }
+      friend ArithmeticT operator>>(const D& x, ArithmeticT y) BOOST_NOEXCEPT
+        { return static_cast<ArithmeticT>(+x >> y); }
+      
+      // Auto-increment and auto-decrement can be defined in terms of the
+      // arithmetic operations.
+      friend D& operator++(D& x) BOOST_NOEXCEPT { return x += 1; }
+      friend D& operator--(D& x) BOOST_NOEXCEPT { return x -= 1; }
+
+#   ifdef BOOST_ENDIAN_MINIMAL_COVER_OPERATORS
+      friend D operator++(D& x, int) BOOST_NOEXCEPT
+      { 
+        D tmp(x);
+        x += 1;
+        return tmp;
+      }
+      friend D operator--(D& x, int) BOOST_NOEXCEPT
+      { 
+        D tmp(x);
+        x -= 1;
+        return tmp;
+      }
+#   endif
+
+#   ifndef BOOST_NO_IO_COVER_OPERATORS
+
+      // Stream inserter
+      template <class charT, class traits>
+      friend std::basic_ostream<charT, traits>&
+        operator<<(std::basic_ostream<charT, traits>& os, const D& x)
+      {
+        return os << +x; 
+      }
+
+      // Stream extractor 
+      template <class charT, class traits>
+      friend std::basic_istream<charT, traits>&
+        operator>>(std::basic_istream<charT, traits>& is, D& x)
+      {
+        ArithmeticT i;
+        if (is >> i)
+          x = i;
+        return is;
+      }
+#   endif
+    };
+  } // namespace endian
+} // namespace boost
+
+#if defined(_MSC_VER)  
+# pragma warning(pop)  
+#endif 
+
+#endif // BOOST_ENDIAN_COVER_OPERATORS_HPP