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+///////////////////////////////////////////////////////////////////////////////
+/// \file when.hpp
+/// Definition of when transform.
+//
+//  Copyright 2008 Eric Niebler. 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_PROTO_TRANSFORM_WHEN_HPP_EAN_10_29_2007
+#define BOOST_PROTO_TRANSFORM_WHEN_HPP_EAN_10_29_2007
+
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
+#include <boost/preprocessor/iteration/iterate.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/map.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/proto/proto_fwd.hpp>
+#include <boost/proto/traits.hpp>
+#include <boost/proto/transform/call.hpp>
+#include <boost/proto/transform/make.hpp>
+#include <boost/proto/transform/impl.hpp>
+#include <boost/proto/transform/env.hpp>
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma warning(push)
+# pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined
+#endif
+
+namespace boost { namespace proto
+{
+    namespace detail
+    {
+        template<typename Grammar, typename R, typename Fun>
+        struct when_impl
+          : transform<when<Grammar, Fun> >
+        {
+            typedef Grammar first;
+            typedef Fun second;
+            typedef typename Grammar::proto_grammar proto_grammar;
+
+            // Note: do not evaluate is_callable<R> in this scope.
+            // R may be an incomplete type at this point.
+
+            template<typename Expr, typename State, typename Data>
+            struct impl : transform_impl<Expr, State, Data>
+            {
+                // OK to evaluate is_callable<R> here. R should be compete by now.
+                typedef
+                    typename mpl::if_c<
+                        is_callable<R>::value
+                      , proto::call<Fun> // "R" is a function to call
+                      , proto::make<Fun> // "R" is an object to construct
+                    >::type
+                which;
+
+                typedef typename which::template impl<Expr, State, Data>::result_type result_type;
+
+                /// Evaluate <tt>R(A0,A1,...)</tt> as a transform either with
+                /// <tt>call\<\></tt> or with <tt>make\<\></tt> depending on
+                /// whether <tt>is_callable\<R\>::value</tt> is \c true or
+                /// \c false.
+                ///
+                /// \param e The current expression
+                /// \param s The current state
+                /// \param d An arbitrary data
+                /// \pre <tt>matches\<Expr, Grammar\>::value</tt> is \c true
+                /// \return <tt>which()(e, s, d)</tt>
+                BOOST_FORCEINLINE
+                result_type operator ()(
+                    typename impl::expr_param   e
+                  , typename impl::state_param  s
+                  , typename impl::data_param   d
+                ) const
+                {
+                    return typename which::template impl<Expr, State, Data>()(e, s, d);
+                }
+            };
+        };
+    }
+
+    /// \brief A grammar element and a PrimitiveTransform that associates
+    /// a transform with the grammar.
+    ///
+    /// Use <tt>when\<\></tt> to override a grammar's default transform
+    /// with a custom transform. It is for used when composing larger
+    /// transforms by associating smaller transforms with individual
+    /// rules in your grammar, as in the following transform which
+    /// counts the number of terminals in an expression.
+    ///
+    /// \code
+    /// // Count the terminals in an expression tree.
+    /// // Must be invoked with initial state == mpl::int_<0>().
+    /// struct CountLeaves
+    ///   : or_<
+    ///         when<terminal<_>, mpl::next<_state>()>
+    ///       , otherwise<fold<_, _state, CountLeaves> >
+    ///     >
+    /// {};
+    /// \endcode
+    ///
+    /// In <tt>when\<G, T\></tt>, when \c T is a class type it is a
+    /// PrimitiveTransform and the following equivalencies hold:
+    ///
+    /// <tt>boost::result_of\<when\<G,T\>(E,S,V)\>::type</tt> is the same as
+    /// <tt>boost::result_of\<T(E,S,V)\>::type</tt>.
+    ///
+    /// <tt>when\<G,T\>()(e,s,d)</tt> is the same as
+    /// <tt>T()(e,s,d)</tt>.
+    template<typename Grammar, typename PrimitiveTransform /*= Grammar*/>
+    struct when
+      : PrimitiveTransform
+    {
+        typedef Grammar first;
+        typedef PrimitiveTransform second;
+        typedef typename Grammar::proto_grammar proto_grammar;
+    };
+
+    /// \brief A specialization that treats function pointer Transforms as
+    /// if they were function type Transforms.
+    ///
+    /// This specialization requires that \c Fun is actually a function type.
+    ///
+    /// This specialization is required for nested transforms such as
+    /// <tt>when\<G, T0(T1(_))\></tt>. In C++, functions that are used as
+    /// parameters to other functions automatically decay to funtion
+    /// pointer types. In other words, the type <tt>T0(T1(_))</tt> is
+    /// indistinguishable from <tt>T0(T1(*)(_))</tt>. This specialization
+    /// is required to handle these nested function pointer type transforms
+    /// properly.
+    template<typename Grammar, typename Fun>
+    struct when<Grammar, Fun *>
+      : when<Grammar, Fun>
+    {};
+
+    /// \brief Syntactic sugar for <tt>when\<_, Fun\></tt>, for use
+    /// in grammars to handle all the cases not yet handled.
+    ///
+    /// Use <tt>otherwise\<T\></tt> in your grammars as a synonym for
+    /// <tt>when\<_, T\></tt> as in the following transform which
+    /// counts the number of terminals in an expression.
+    ///
+    /// \code
+    /// // Count the terminals in an expression tree.
+    /// // Must be invoked with initial state == mpl::int_<0>().
+    /// struct CountLeaves
+    ///   : or_<
+    ///         when<terminal<_>, mpl::next<_state>()>
+    ///       , otherwise<fold<_, _state, CountLeaves> >
+    ///     >
+    /// {};
+    /// \endcode
+    template<typename Fun>
+    struct otherwise
+      : when<_, Fun>
+    {};
+
+    namespace envns_
+    {
+        // Define the transforms global
+        BOOST_PROTO_DEFINE_ENV_VAR(transforms_type, transforms);
+    }
+
+    using envns_::transforms;
+
+    /// \brief This specialization uses the Data parameter as a collection
+    /// of transforms that can be indexed by the specified rule.
+    ///
+    /// Use <tt>when\<T, external_transform\></tt> in your code when you would like
+    /// to define a grammar once and use it to evaluate expressions with
+    /// many different sets of transforms. The transforms are found by
+    /// using the Data parameter as a map from rules to transforms.
+    ///
+    /// See \c action_map for an example.
+    template<typename Grammar>
+    struct when<Grammar, external_transform>
+      : proto::transform<when<Grammar, external_transform> >
+    {
+        typedef Grammar first;
+        typedef external_transform second;
+        typedef typename Grammar::proto_grammar proto_grammar;
+
+        template<typename Expr, typename State, typename Data>
+        struct impl
+          : remove_reference<
+                typename mpl::eval_if_c<
+                    proto::result_of::has_env_var<Data, transforms_type>::value
+                  , proto::result_of::env_var<Data, transforms_type>
+                  , proto::result_of::env_var<Data, data_type>
+                >::type
+            >::type::template when<Grammar>::template impl<Expr, State, Data>
+        {};
+    };
+
+    /// \brief For defining a map of Rule/Transform pairs for use with
+    /// <tt>when\<T, external_transform\></tt> to make transforms external to the grammar
+    ///
+    /// The following code defines a grammar with a couple of external transforms.
+    /// It also defines an action_map that maps from rules to transforms. It then
+    /// passes that transforms map at the Data parameter to the grammar. In this way,
+    /// the behavior of the grammar can be modified post-hoc by passing a different
+    /// action_map.
+    ///
+    /// \code
+    /// struct int_terminal
+    ///   : proto::terminal<int>
+    /// {};
+    /// 
+    /// struct char_terminal
+    ///   : proto::terminal<char>
+    /// {};
+    /// 
+    /// struct my_grammar
+    ///   : proto::or_<
+    ///         proto::when< int_terminal, proto::external_transform >
+    ///       , proto::when< char_terminal, proto::external_transform >
+    ///       , proto::when<
+    ///             proto::plus< my_grammar, my_grammar >
+    ///           , proto::fold< _, int(), my_grammar >
+    ///         >
+    ///     >
+    /// {};
+    /// 
+    /// struct my_transforms
+    ///   : proto::external_transforms<
+    ///         proto::when<int_terminal, print(proto::_value)>
+    ///       , proto::when<char_terminal, print(proto::_value)>
+    ///     >
+    /// {};
+    ///
+    /// proto::literal<int> i(1);
+    /// proto::literal<char> c('a');
+    /// my_transforms trx;
+    ///
+    /// // Evaluate "i+c" using my_grammar with the specified transforms:
+    /// my_grammar()(i + c, 0, trx);
+    /// \endcode
+    template<BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(BOOST_MPL_LIMIT_MAP_SIZE, typename T, mpl::na)>
+    struct external_transforms
+    {
+        typedef mpl::map<BOOST_PP_ENUM_PARAMS(BOOST_MPL_LIMIT_MAP_SIZE, T)> map_type;
+
+        template<typename Rule>
+        struct when
+          : proto::when<_, typename mpl::at<map_type, Rule>::type>
+        {};
+    };
+
+    // Other specializations of proto::when are generated by the preprocessor...
+    #include <boost/proto/transform/detail/when.hpp>
+
+    /// INTERNAL ONLY
+    ///
+    template<typename Grammar, typename Transform>
+    struct is_callable<when<Grammar, Transform> >
+      : mpl::true_
+    {};
+
+}} // namespace boost::proto
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma warning(pop)
+#endif
+
+#endif