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+//  operator_return_type_traits.hpp -- Boost Lambda Library ------------------
+
+// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
+//
+// 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)
+//
+// For more information, see www.boost.org
+
+#ifndef BOOST_LAMBDA_OPERATOR_RETURN_TYPE_TRAITS_HPP
+#define BOOST_LAMBDA_OPERATOR_RETURN_TYPE_TRAITS_HPP
+
+#include "boost/lambda/detail/is_instance_of.hpp"
+#include "boost/type_traits/same_traits.hpp"
+
+#include "boost/indirect_reference.hpp"
+#include "boost/detail/container_fwd.hpp"
+
+#include <cstddef> // needed for the ptrdiff_t
+#include <iosfwd>  // for istream and ostream
+
+#include <iterator> // needed for operator&
+
+namespace boost { 
+namespace lambda {
+namespace detail {
+
+// -- general helper templates for type deduction ------------------
+
+// Much of the type deduction code for standard arithmetic types from Gary Powell
+
+template <class A> struct promote_code { static const int value = -1; };
+// this means that a code is not defined for A
+
+// -- the next 5 types are needed in if_then_else_return 
+// the promotion order is not important, but they must have distinct values.
+template <> struct promote_code<bool> { static const int value = 10; };
+template <> struct promote_code<char> { static const int value = 20; };
+template <> struct promote_code<unsigned char> { static const int value = 30; };
+template <> struct promote_code<signed char> { static const int value = 40; };
+template <> struct promote_code<short int> { static const int value = 50; };
+// ----------
+
+template <> struct promote_code<int> { static const int value = 100; };
+template <> struct promote_code<unsigned int> { static const int value = 200; };
+template <> struct promote_code<long> { static const int value = 300; };
+template <> struct promote_code<unsigned long> { static const int value = 400; };
+
+template <> struct promote_code<float> { static const int value = 500; };
+template <> struct promote_code<double> { static const int value = 600; };
+template <> struct promote_code<long double> { static const int value = 700; };
+
+// TODO: wchar_t
+
+// forward delcaration of complex.
+
+} // namespace detail
+} // namespace lambda 
+} // namespace boost
+
+namespace boost { 
+namespace lambda {
+namespace detail {
+
+template <> struct promote_code< std::complex<float> > { static const int value = 800; };
+template <> struct promote_code< std::complex<double> > { static const int value = 900; };
+template <> struct promote_code< std::complex<long double> > { static const int value = 1000; };
+
+// -- int promotion -------------------------------------------
+template <class T> struct promote_to_int { typedef T type; };
+
+template <> struct promote_to_int<bool> { typedef int type; };
+template <> struct promote_to_int<char> { typedef int type; };
+template <> struct promote_to_int<unsigned char> { typedef int type; };
+template <> struct promote_to_int<signed char> { typedef int type; };
+template <> struct promote_to_int<short int> { typedef int type; };
+
+// The unsigned short int promotion rule is this:
+// unsigned short int to signed int if a signed int can hold all values 
+// of unsigned short int, otherwise go to unsigned int.
+template <> struct promote_to_int<unsigned short int>
+{ 
+        typedef
+                detail::IF<sizeof(int) <= sizeof(unsigned short int),        
+// I had the logic reversed but ">" messes up the parsing.
+                unsigned int,
+                int>::RET type; 
+};
+
+
+// TODO: think, should there be default behaviour for non-standard types?
+
+} // namespace detail
+
+// ------------------------------------------ 
+// Unary actions ----------------------------
+// ------------------------------------------ 
+
+template<class Act, class A>
+struct plain_return_type_1 {
+  typedef detail::unspecified type;
+};
+
+
+
+template<class Act, class A>
+struct plain_return_type_1<unary_arithmetic_action<Act>, A> {
+  typedef A type;
+};
+
+template<class Act, class A> 
+struct return_type_1<unary_arithmetic_action<Act>, A> { 
+  typedef 
+    typename plain_return_type_1<
+      unary_arithmetic_action<Act>,
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type;
+};
+
+
+template<class A>
+struct plain_return_type_1<bitwise_action<not_action>, A> {
+  typedef A type;
+};
+
+// bitwise not, operator~()
+template<class A> struct return_type_1<bitwise_action<not_action>, A> {
+  typedef 
+    typename plain_return_type_1<
+      bitwise_action<not_action>,
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type;
+};
+
+
+// prefix increment and decrement operators return 
+// their argument by default as a non-const reference
+template<class Act, class A> 
+struct plain_return_type_1<pre_increment_decrement_action<Act>, A> {
+  typedef A& type;
+};
+
+template<class Act, class A> 
+struct return_type_1<pre_increment_decrement_action<Act>, A> {
+  typedef 
+    typename plain_return_type_1<
+      pre_increment_decrement_action<Act>,
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type;
+};
+
+// post decrement just returns the same plain type.
+template<class Act, class A>
+struct plain_return_type_1<post_increment_decrement_action<Act>, A> {
+  typedef A type;
+};
+
+template<class Act, class A> 
+struct return_type_1<post_increment_decrement_action<Act>, A> 
+{ 
+  typedef 
+    typename plain_return_type_1<
+      post_increment_decrement_action<Act>,
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type;
+};
+
+// logical not, operator!()
+template<class A> 
+struct plain_return_type_1<logical_action<not_action>, A> {
+  typedef bool type;
+};
+
+template<class A>
+struct return_type_1<logical_action<not_action>, A> {
+  typedef 
+    typename plain_return_type_1<
+      logical_action<not_action>,
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type;
+};
+
+// address of action ---------------------------------------
+
+
+template<class A> 
+struct return_type_1<other_action<addressof_action>, A> { 
+  typedef 
+    typename plain_return_type_1<
+      other_action<addressof_action>, 
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type1;
+
+  // If no user defined specialization for A, then return the
+  // cv qualified pointer to A
+  typedef typename detail::IF<
+    boost::is_same<type1, detail::unspecified>::value, 
+    typename boost::remove_reference<A>::type*,
+    type1
+  >::RET type;
+};
+
+// contentsof action ------------------------------------
+
+// TODO: this deduction may lead to fail directly, 
+// (if A has no specialization for iterator_traits and has no
+// typedef A::reference.
+// There is no easy way around this, cause there doesn't seem to be a way
+// to test whether a class is an iterator or not.
+ 
+// The default works with std::iterators.
+
+namespace detail {
+
+  // A is a nonreference type
+template <class A> struct contentsof_type {
+  typedef typename boost::indirect_reference<A>::type type; 
+};
+
+  // this is since the nullary () in lambda_functor is always instantiated
+template <> struct contentsof_type<null_type> {
+  typedef detail::unspecified type;
+};
+
+
+template <class A> struct contentsof_type<const A> {
+  typedef typename contentsof_type<A>::type type;
+};
+
+template <class A> struct contentsof_type<volatile A> {
+  typedef typename contentsof_type<A>::type type;
+};
+
+template <class A> struct contentsof_type<const volatile A> {
+  typedef typename contentsof_type<A>::type type;
+};
+
+  // standard iterator traits should take care of the pointer types 
+  // but just to be on the safe side, we have the specializations here:
+  // these work even if A is cv-qualified.
+template <class A> struct contentsof_type<A*> {
+  typedef A& type;
+};
+template <class A> struct contentsof_type<A* const> {
+  typedef A& type;
+};
+template <class A> struct contentsof_type<A* volatile> {
+  typedef A& type;
+};
+template <class A> struct contentsof_type<A* const volatile> {
+  typedef A& type;
+};
+
+template<class A, int N> struct contentsof_type<A[N]> { 
+  typedef A& type; 
+};
+template<class A, int N> struct contentsof_type<const A[N]> { 
+  typedef const A& type; 
+};
+template<class A, int N> struct contentsof_type<volatile A[N]> { 
+  typedef volatile A& type; 
+};
+template<class A, int N> struct contentsof_type<const volatile A[N]> { 
+  typedef const volatile A& type; 
+};
+
+
+
+
+
+} // end detail
+
+template<class A> 
+struct return_type_1<other_action<contentsof_action>, A> { 
+
+  typedef 
+    typename plain_return_type_1<
+      other_action<contentsof_action>, 
+      typename detail::remove_reference_and_cv<A>::type
+    >::type type1;
+
+  // If no user defined specialization for A, then return the
+  // cv qualified pointer to A
+  typedef typename 
+  detail::IF_type<
+    boost::is_same<type1, detail::unspecified>::value, 
+    detail::contentsof_type<
+      typename boost::remove_reference<A>::type
+    >,
+    detail::identity_mapping<type1>
+  >::type type;
+};
+
+
+// ------------------------------------------------------------------
+// binary actions ---------------------------------------------------
+// ------------------------------------------------------------------
+
+// here the default case is: no user defined versions:
+template <class Act, class A, class B>
+struct plain_return_type_2 {
+  typedef detail::unspecified type; 
+};
+
+namespace detail {
+
+// error classes
+class illegal_pointer_arithmetic{};
+
+// pointer arithmetic type deductions ----------------------
+// value = false means that this is not a pointer arithmetic case
+// value = true means, that this can be a pointer arithmetic case, but not necessarily is
+// This means, that for user defined operators for pointer types, say for some operator+(X, *Y),
+// the deductions must be coded at an earliel level (return_type_2).
+
+template<class Act, class A, class B> 
+struct pointer_arithmetic_traits { static const bool value = false; };
+
+template<class A, class B> 
+struct pointer_arithmetic_traits<plus_action, A, B> { 
+
+  typedef typename 
+    array_to_pointer<typename boost::remove_reference<A>::type>::type AP;
+  typedef typename 
+    array_to_pointer<typename boost::remove_reference<B>::type>::type BP;
+
+  static const bool is_pointer_A = boost::is_pointer<AP>::value;
+  static const bool is_pointer_B = boost::is_pointer<BP>::value;  
+
+  static const bool value = is_pointer_A || is_pointer_B;
+
+  // can't add two pointers.
+  // note, that we do not check wether the other type is valid for 
+  // addition with a pointer.
+  // the compiler will catch it in the apply function
+
+  typedef typename 
+  detail::IF<
+    is_pointer_A && is_pointer_B, 
+      detail::return_type_deduction_failure<
+        detail::illegal_pointer_arithmetic
+      >,
+      typename detail::IF<is_pointer_A, AP, BP>::RET
+  >::RET type; 
+
+};
+
+template<class A, class B> 
+struct pointer_arithmetic_traits<minus_action, A, B> { 
+  typedef typename 
+    array_to_pointer<typename boost::remove_reference<A>::type>::type AP;
+  typedef typename 
+    array_to_pointer<typename boost::remove_reference<B>::type>::type BP;
+
+  static const bool is_pointer_A = boost::is_pointer<AP>::value;
+  static const bool is_pointer_B = boost::is_pointer<BP>::value;  
+
+  static const bool value = is_pointer_A || is_pointer_B;
+
+  static const bool same_pointer_type =
+    is_pointer_A && is_pointer_B && 
+    boost::is_same<
+      typename boost::remove_const<
+        typename boost::remove_pointer<
+          typename boost::remove_const<AP>::type
+        >::type
+      >::type,
+      typename boost::remove_const<
+        typename boost::remove_pointer<
+          typename boost::remove_const<BP>::type
+        >::type
+      >::type
+    >::value;
+
+  // ptr - ptr has type ptrdiff_t
+  // note, that we do not check if, in ptr - B, B is 
+  // valid for subtraction with a pointer.
+  // the compiler will catch it in the apply function
+
+  typedef typename 
+  detail::IF<
+    same_pointer_type, const std::ptrdiff_t,
+    typename detail::IF<
+      is_pointer_A, 
+      AP, 
+      detail::return_type_deduction_failure<detail::illegal_pointer_arithmetic>
+    >::RET
+  >::RET type; 
+};
+
+} // namespace detail
+   
+// -- arithmetic actions ---------------------------------------------
+
+namespace detail {
+   
+template<bool is_pointer_arithmetic, class Act, class A, class B> 
+struct return_type_2_arithmetic_phase_1;
+
+template<class A, class B> struct return_type_2_arithmetic_phase_2;
+template<class A, class B> struct return_type_2_arithmetic_phase_3;
+
+} // namespace detail
+  
+
+// drop any qualifiers from the argument types within arithmetic_action
+template<class A, class B, class Act> 
+struct return_type_2<arithmetic_action<Act>, A, B>
+{
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<arithmetic_action<Act>, plain_A, plain_B>::type type1;
+  
+  // if user defined return type, do not enter the whole arithmetic deductions
+  typedef typename 
+    detail::IF_type<
+      boost::is_same<type1, detail::unspecified>::value, 
+      detail::return_type_2_arithmetic_phase_1<
+         detail::pointer_arithmetic_traits<Act, A, B>::value, Act, A, B
+      >,
+      plain_return_type_2<arithmetic_action<Act>, plain_A, plain_B>
+    >::type type;
+};
+
+namespace detail {
+   
+// perform integral promotion, no pointer arithmetic
+template<bool is_pointer_arithmetic, class Act, class A, class B> 
+struct return_type_2_arithmetic_phase_1
+{
+  typedef typename 
+    return_type_2_arithmetic_phase_2<
+      typename remove_reference_and_cv<A>::type,
+      typename remove_reference_and_cv<B>::type
+    >::type type;
+};
+
+// pointer_arithmetic
+template<class Act, class A, class B> 
+struct return_type_2_arithmetic_phase_1<true, Act, A, B>
+{
+  typedef typename 
+    pointer_arithmetic_traits<Act, A, B>::type type;
+};
+
+template<class A, class B>
+struct return_type_2_arithmetic_phase_2 {
+  typedef typename
+    return_type_2_arithmetic_phase_3<
+      typename promote_to_int<A>::type, 
+      typename promote_to_int<B>::type
+    >::type type;
+};
+
+// specialization for unsigned int.
+// We only have to do these two specialization because the value promotion will
+// take care of the other cases.
+// The unsigned int promotion rule is this:
+// unsigned int to long if a long can hold all values of unsigned int,
+// otherwise go to unsigned long.
+
+// struct so I don't have to type this twice.
+struct promotion_of_unsigned_int
+{
+        typedef
+        detail::IF<sizeof(long) <= sizeof(unsigned int),        
+                unsigned long,
+                long>::RET type; 
+};
+
+template<>
+struct return_type_2_arithmetic_phase_2<unsigned int, long>
+{
+        typedef promotion_of_unsigned_int::type type;
+};
+template<>
+struct return_type_2_arithmetic_phase_2<long, unsigned int>
+{
+        typedef promotion_of_unsigned_int::type type;
+};
+
+
+template<class A, class B> struct return_type_2_arithmetic_phase_3 { 
+   enum { promote_code_A_value = promote_code<A>::value,
+         promote_code_B_value = promote_code<B>::value }; // enums for KCC
+  typedef typename
+    detail::IF<
+      promote_code_A_value == -1 || promote_code_B_value == -1,
+      detail::return_type_deduction_failure<return_type_2_arithmetic_phase_3>,
+      typename detail::IF<
+        ((int)promote_code_A_value > (int)promote_code_B_value), 
+        A, 
+        B
+      >::RET
+    >::RET type;                    
+};
+
+} // namespace detail
+
+// --  bitwise actions -------------------------------------------
+// note: for integral types deuduction is similar to arithmetic actions. 
+
+// drop any qualifiers from the argument types within arithmetic action
+template<class A, class B, class Act> 
+struct return_type_2<bitwise_action<Act>, A, B>
+{
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<bitwise_action<Act>, plain_A, plain_B>::type type1;
+  
+  // if user defined return type, do not enter type deductions
+  typedef typename 
+    detail::IF_type<
+      boost::is_same<type1, detail::unspecified>::value, 
+      return_type_2<arithmetic_action<plus_action>, A, B>,
+      plain_return_type_2<bitwise_action<Act>, plain_A, plain_B>
+    >::type type;
+
+  // plus_action is just a random pick, has to be a concrete instance
+
+  // TODO: This check is only valid for built-in types, overloaded types might
+  // accept floating point operators
+
+  // bitwise operators not defined for floating point types
+  // these test are not strictly needed here, since the error will be caught in
+  // the apply function
+  BOOST_STATIC_ASSERT(!(boost::is_float<plain_A>::value && boost::is_float<plain_B>::value));
+
+};
+
+namespace detail {
+
+#ifdef BOOST_NO_TEMPLATED_STREAMS
+
+template<class A, class B>
+struct leftshift_type {
+
+  typedef typename detail::IF<
+    boost::is_convertible<
+      typename boost::remove_reference<A>::type*,
+      std::ostream*
+    >::value,
+    std::ostream&, 
+    typename detail::remove_reference_and_cv<A>::type
+  >::RET type;
+};
+
+template<class A, class B>
+struct rightshift_type {
+
+  typedef typename detail::IF<
+
+    boost::is_convertible<
+      typename boost::remove_reference<A>::type*,
+      std::istream*
+    >::value, 
+    std::istream&,
+    typename detail::remove_reference_and_cv<A>::type
+  >::RET type;
+};
+
+#else
+
+template <class T> struct get_ostream_type {
+  typedef std::basic_ostream<typename T::char_type, 
+                             typename T::traits_type>& type;
+};
+
+template <class T> struct get_istream_type {
+  typedef std::basic_istream<typename T::char_type, 
+                             typename T::traits_type>& type;
+};
+
+template<class A, class B>
+struct leftshift_type {
+private:
+  typedef typename boost::remove_reference<A>::type plainA;
+public:
+  typedef typename detail::IF_type<
+    is_instance_of_2<plainA, std::basic_ostream>::value, 
+    get_ostream_type<plainA>, //reference to the stream 
+    detail::remove_reference_and_cv<A>
+  >::type type;
+};
+
+template<class A, class B>
+struct rightshift_type {
+private:
+  typedef typename boost::remove_reference<A>::type plainA;
+public:
+  typedef typename detail::IF_type<
+    is_instance_of_2<plainA, std::basic_istream>::value, 
+    get_istream_type<plainA>, //reference to the stream 
+    detail::remove_reference_and_cv<A>
+  >::type type;
+};
+
+
+#endif
+
+} // end detail
+
+// ostream
+template<class A, class B> 
+struct return_type_2<bitwise_action<leftshift_action>, A, B>
+{
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<bitwise_action<leftshift_action>, plain_A, plain_B>::type type1;
+  
+  // if user defined return type, do not enter type deductions
+  typedef typename 
+    detail::IF_type<
+      boost::is_same<type1, detail::unspecified>::value, 
+      detail::leftshift_type<A, B>,
+      plain_return_type_2<bitwise_action<leftshift_action>, plain_A, plain_B>
+    >::type type;
+};
+
+// istream
+template<class A, class B> 
+struct return_type_2<bitwise_action<rightshift_action>, A, B>
+{
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<bitwise_action<rightshift_action>, plain_A, plain_B>::type type1;
+  
+  // if user defined return type, do not enter type deductions
+  typedef typename 
+    detail::IF_type<
+      boost::is_same<type1, detail::unspecified>::value, 
+      detail::rightshift_type<A, B>,
+      plain_return_type_2<bitwise_action<rightshift_action>, plain_A, plain_B>
+    >::type type;
+};
+
+// -- logical actions ----------------------------------------
+// always bool
+// NOTE: this may not be true for some weird user-defined types,
+template<class A, class B, class Act> 
+struct plain_return_type_2<logical_action<Act>, A, B> { 
+  typedef bool type; 
+};
+
+template<class A, class B, class Act> 
+struct return_type_2<logical_action<Act>, A, B> { 
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<logical_action<Act>, plain_A, plain_B>::type type;
+  
+};
+
+
+// -- relational actions ----------------------------------------
+// always bool
+// NOTE: this may not be true for some weird user-defined types,
+template<class A, class B, class Act> 
+struct plain_return_type_2<relational_action<Act>, A, B> { 
+  typedef bool type; 
+};
+
+template<class A, class B, class Act> 
+struct return_type_2<relational_action<Act>, A, B> { 
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<relational_action<Act>, plain_A, plain_B>::type type; 
+};
+
+// Assingment actions -----------------------------------------------
+// return type is the type of the first argument as reference
+
+// note that cv-qualifiers are preserved.
+// Yes, assignment operator can be const!
+
+// NOTE: this may not be true for some weird user-defined types,
+
+template<class A, class B, class Act> 
+struct return_type_2<arithmetic_assignment_action<Act>, A, B> { 
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<
+      arithmetic_assignment_action<Act>, plain_A, plain_B
+    >::type type1;
+  
+  typedef typename 
+    detail::IF<
+      boost::is_same<type1, detail::unspecified>::value, 
+      typename boost::add_reference<A>::type,
+      type1
+    >::RET type;
+};
+
+template<class A, class B, class Act> 
+struct return_type_2<bitwise_assignment_action<Act>, A, B> { 
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<
+      bitwise_assignment_action<Act>, plain_A, plain_B
+    >::type type1;
+  
+  typedef typename 
+    detail::IF<
+      boost::is_same<type1, detail::unspecified>::value, 
+      typename boost::add_reference<A>::type,
+      type1
+    >::RET type;
+};
+
+template<class A, class B> 
+struct return_type_2<other_action<assignment_action>, A, B> { 
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<
+      other_action<assignment_action>, plain_A, plain_B
+    >::type type1;
+  
+  typedef typename 
+    detail::IF<
+      boost::is_same<type1, detail::unspecified>::value, 
+      typename boost::add_reference<A>::type,
+      type1
+    >::RET type;
+};
+
+// -- other actions ----------------------------------------
+
+// comma action ----------------------------------
+// Note: this may not be true for some weird user-defined types,
+
+// NOTE! This only tries the plain_return_type_2 layer and gives
+// detail::unspecified as default. If no such specialization is found, the 
+// type rule in the spcecialization of the return_type_2_prot is used
+// to give the type of the right argument (which can be a reference too)
+// (The built in operator, can return a l- or rvalue).
+template<class A, class B> 
+struct return_type_2<other_action<comma_action>, A, B> { 
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename 
+    plain_return_type_2<
+      other_action<comma_action>, plain_A, plain_B
+    >::type type;
+  };
+
+// subscript action -----------------------------------------------
+
+
+namespace detail {
+  // A and B are nonreference types
+template <class A, class B> struct subscript_type {
+  typedef detail::unspecified type; 
+};
+
+template <class A, class B> struct subscript_type<A*, B> {
+  typedef A& type;
+};
+template <class A, class B> struct subscript_type<A* const, B> {
+  typedef A& type;
+};
+template <class A, class B> struct subscript_type<A* volatile, B> {
+  typedef A& type;
+};
+template <class A, class B> struct subscript_type<A* const volatile, B> {
+  typedef A& type;
+};
+
+
+template<class A, class B, int N> struct subscript_type<A[N], B> { 
+  typedef A& type; 
+};
+
+  // these 3 specializations are needed to make gcc <3 happy
+template<class A, class B, int N> struct subscript_type<const A[N], B> { 
+  typedef const A& type; 
+};
+template<class A, class B, int N> struct subscript_type<volatile A[N], B> { 
+  typedef volatile A& type; 
+};
+template<class A, class B, int N> struct subscript_type<const volatile A[N], B> { 
+  typedef const volatile A& type; 
+};
+
+} // end detail
+
+template<class A, class B>
+struct return_type_2<other_action<subscript_action>, A, B> {
+
+  typedef typename detail::remove_reference_and_cv<A>::type plain_A;
+  typedef typename detail::remove_reference_and_cv<B>::type plain_B;
+
+  typedef typename boost::remove_reference<A>::type nonref_A;
+  typedef typename boost::remove_reference<B>::type nonref_B;
+
+  typedef typename 
+    plain_return_type_2<
+      other_action<subscript_action>, plain_A, plain_B
+    >::type type1;
+  
+  typedef typename 
+    detail::IF_type<
+      boost::is_same<type1, detail::unspecified>::value, 
+      detail::subscript_type<nonref_A, nonref_B>,
+      plain_return_type_2<other_action<subscript_action>, plain_A, plain_B>
+    >::type type;
+
+};
+
+template<class Key, class T, class Cmp, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, std::map<Key, T, Cmp, Allocator>, B> { 
+  typedef T& type;
+  // T == std::map<Key, T, Cmp, Allocator>::mapped_type; 
+};
+
+template<class Key, class T, class Cmp, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, std::multimap<Key, T, Cmp, Allocator>, B> { 
+  typedef T& type;
+  // T == std::map<Key, T, Cmp, Allocator>::mapped_type; 
+};
+
+  // deque
+template<class T, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, std::deque<T, Allocator>, B> { 
+  typedef typename std::deque<T, Allocator>::reference type;
+};
+template<class T, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, const std::deque<T, Allocator>, B> { 
+  typedef typename std::deque<T, Allocator>::const_reference type;
+};
+
+  // vector
+template<class T, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, std::vector<T, Allocator>, B> { 
+  typedef typename std::vector<T, Allocator>::reference type;
+};
+template<class T, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, const std::vector<T, Allocator>, B> { 
+  typedef typename std::vector<T, Allocator>::const_reference type;
+};
+
+  // basic_string
+template<class Char, class Traits, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, std::basic_string<Char, Traits, Allocator>, B> { 
+  typedef typename std::basic_string<Char, Traits, Allocator>::reference type;
+};
+template<class Char, class Traits, class Allocator, class B> 
+struct plain_return_type_2<other_action<subscript_action>, const std::basic_string<Char, Traits, Allocator>, B> { 
+  typedef typename std::basic_string<Char, Traits, Allocator>::const_reference type;
+};
+
+template<class Char, class Traits, class Allocator> 
+struct plain_return_type_2<arithmetic_action<plus_action>,
+                           std::basic_string<Char, Traits, Allocator>,
+                           std::basic_string<Char, Traits, Allocator> > { 
+  typedef std::basic_string<Char, Traits, Allocator> type;
+};
+
+template<class Char, class Traits, class Allocator> 
+struct plain_return_type_2<arithmetic_action<plus_action>,
+                           const Char*,
+                           std::basic_string<Char, Traits, Allocator> > { 
+  typedef std::basic_string<Char, Traits, Allocator> type;
+};
+
+template<class Char, class Traits, class Allocator> 
+struct plain_return_type_2<arithmetic_action<plus_action>,
+                           std::basic_string<Char, Traits, Allocator>,
+                           const Char*> { 
+  typedef std::basic_string<Char, Traits, Allocator> type;
+};
+
+template<class Char, class Traits, class Allocator, std::size_t N> 
+struct plain_return_type_2<arithmetic_action<plus_action>,
+                           Char[N],
+                           std::basic_string<Char, Traits, Allocator> > { 
+  typedef std::basic_string<Char, Traits, Allocator> type;
+};
+
+template<class Char, class Traits, class Allocator, std::size_t N> 
+struct plain_return_type_2<arithmetic_action<plus_action>,
+                           std::basic_string<Char, Traits, Allocator>,
+                           Char[N]> { 
+  typedef std::basic_string<Char, Traits, Allocator> type;
+};
+
+
+} // namespace lambda
+} // namespace boost
+
+#endif
+
+