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Subject: [Boost-commit] svn:boost r72044 - in branches/release: . boost boost/algorithm/string boost/archive boost/bimap boost/config boost/config/compiler boost/date_time boost/date_time/posix_time boost/detail boost/filesystem boost/function boost/functional boost/functional/hash boost/fusion boost/fusion/container/list/detail boost/geometry boost/geometry/algorithms boost/geometry/arithmetic boost/geometry/core boost/geometry/domains boost/geometry/geometries boost/geometry/iterators boost/geometry/multi boost/geometry/policies boost/geometry/strategies boost/geometry/util boost/geometry/views boost/gil boost/graph boost/icl boost/integer boost/interprocess boost/intrusive boost/io boost/iostreams boost/iterator boost/msm boost/msm/back boost/msm/front/euml boost/numeric/ublas boost/pool boost/program_options boost/program_options/detail boost/property_tree boost/proto boost/proto/detail boost/proto/detail/preprocessed boost/python boost/range boost/serialization boost/signals boost/signals2 boost/spirit boost/spirit/home boost/spirit/home/karma boost/spirit/home/support boost/statechart boost/system boost/thread boost/tr1 boost/type_traits boost/typeof boost/unordered boost/utility boost/uuid boost/variant boost/wave boost/xpressive doc libs libs/algorithm/string libs/array libs/array/test libs/bimap libs/config libs/date_time libs/date_time/data libs/date_time/example/gregorian libs/date_time/example/local_time libs/date_time/example/posix_time libs/date_time/example/tutorial libs/date_time/test/posix_time libs/date_time/xmldoc libs/detail libs/filesystem libs/function libs/functional libs/functional/hash libs/fusion libs/geometry libs/geometry/doc libs/geometry/doc/concept libs/geometry/doc/doxy libs/geometry/doc/generated libs/geometry/doc/html libs/geometry/doc/reference libs/geometry/doc/src libs/geometry/example libs/geometry/test libs/graph/doc libs/graph_parallel libs/icl libs/icl/doc libs/icl/doc/html libs/icl/doc/html/header/boost/icl libs/icl/test libs/icl/test/test_doc_code_ libs/integer libs/interprocess libs/intrusive libs/io libs/io/doc libs/iostreams libs/iterator libs/mpi/build libs/mpl/doc/refmanual libs/mpl/doc/src/refmanual libs/msm libs/numeric/ublas libs/numeric/ublas/doc libs/parameter/doc/html libs/phoenix/doc libs/phoenix/doc/examples libs/pool libs/program_options libs/program_options/test libs/property_tree libs/proto/doc libs/proto/doc/reference libs/python libs/range libs/serialization libs/serialization/example libs/serialization/src libs/serialization/test libs/signals libs/signals2 libs/spirit libs/spirit/classic/example libs/spirit/doc libs/spirit/example libs/spirit/phoenix libs/spirit/test libs/spirit/test/qi libs/statechart libs/static_assert libs/system libs/thread libs/thread/src/win32 libs/timer libs/tr1 libs/type_traits libs/typeof/doc libs/unordered libs/utility libs/utility/swap/test libs/uuid libs/wave more status tools tools/bcp tools/boostbook tools/build/v2 tools/inspect tools/quickbook tools/quickbook/doc tools/quickbook/src tools/quickbook/test tools/regression tools/regression/src tools/release tools/wave
From: eric_at_[hidden]
Date: 2011-05-19 06:18:18
Author: eric_niebler
Date: 2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
New Revision: 72044
URL: http://svn.boost.org/trac/boost/changeset/72044
Log:
merge [71978] from trunk
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Text files modified: 
   branches/release/boost/proto/detail/basic_expr.hpp              |     2                                         
   branches/release/boost/proto/detail/deduce_domain.hpp           |    40 ++++++++++++++++++++++++++              
   branches/release/boost/proto/detail/preprocessed/basic_expr.hpp |    22 +++++++-------                          
   branches/release/boost/proto/domain.hpp                         |     7 ++++                                    
   branches/release/boost/proto/generate.hpp                       |    61 ++++++++++++++++++++++++++++++++------- 
   branches/release/boost/proto/operators.hpp                      |     4 +-                                      
   branches/release/boost/proto/proto_fwd.hpp                      |     4 ++                                      
   branches/release/libs/proto/doc/reference.xml                   |    10 ++++++                                  
   branches/release/libs/proto/doc/reference/domain.xml            |    31 +++++++++++++++----                     
   branches/release/libs/proto/doc/reference/expr.xml              |     2                                         
   branches/release/libs/proto/doc/reference/generate.xml          |    13 +++++++                                 
   11 files changed, 161 insertions(+), 35 deletions(-)
Modified: branches/release/boost/proto/detail/basic_expr.hpp
==============================================================================
--- branches/release/boost/proto/detail/basic_expr.hpp	(original)
+++ branches/release/boost/proto/detail/basic_expr.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -98,7 +98,7 @@
         typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args;
         #endif
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
Modified: branches/release/boost/proto/detail/deduce_domain.hpp
==============================================================================
--- branches/release/boost/proto/detail/deduce_domain.hpp	(original)
+++ branches/release/boost/proto/detail/deduce_domain.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -70,10 +70,20 @@
               : domain_<not_a_domain>
             {};
 
+            template<>
+            struct domain_<basic_default_domain>
+              : domain_<not_a_domain>
+            {};
+
             sized_type<1>::type default_test(void*, void*);
             sized_type<2>::type default_test(domain_<default_domain>*, void*);
+            sized_type<2>::type default_test(domain_<basic_default_domain>*, void*);
             sized_type<3>::type default_test(void*, domain_<default_domain>*);
+            sized_type<3>::type default_test(void*, domain_<basic_default_domain>*);
             sized_type<4>::type default_test(domain_<default_domain>*, domain_<default_domain>*);
+            sized_type<4>::type default_test(domain_<basic_default_domain>*, domain_<default_domain>*);
+            sized_type<4>::type default_test(domain_<default_domain>*, domain_<basic_default_domain>*);
+            sized_type<4>::type default_test(domain_<basic_default_domain>*, domain_<basic_default_domain>*);
 
         #ifdef BOOST_NO_DECLTYPE
             template<int N, typename Domain>
@@ -131,18 +141,48 @@
                 typedef D0 type;
             };
 
+            template<typename D0>
+            struct common_domain2<D0, basic_default_domain, 4>
+            {
+                typedef D0 type;
+            };
+
             template<typename D1>
             struct common_domain2<default_domain, D1, 4>
             {
                 typedef D1 type;
             };
 
+            template<typename D1>
+            struct common_domain2<basic_default_domain, D1, 4>
+            {
+                typedef D1 type;
+            };
+
             template<>
             struct common_domain2<default_domain, default_domain, 4>
             {
                 typedef default_domain type;
             };
 
+            template<>
+            struct common_domain2<basic_default_domain, default_domain, 4>
+            {
+                typedef default_domain type;
+            };
+
+            template<>
+            struct common_domain2<default_domain, basic_default_domain, 4>
+            {
+                typedef default_domain type;
+            };
+
+            template<>
+            struct common_domain2<basic_default_domain, basic_default_domain, 4>
+            {
+                typedef basic_default_domain type;
+            };
+
             template<typename E0, typename E1>
             struct deduce_domain2
               : common_domain2<
Modified: branches/release/boost/proto/detail/preprocessed/basic_expr.hpp
==============================================================================
--- branches/release/boost/proto/detail/preprocessed/basic_expr.hpp	(original)
+++ branches/release/boost/proto/detail/preprocessed/basic_expr.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -42,7 +42,7 @@
         typedef basic_expr proto_base_expr;
         typedef term<Arg0> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -116,7 +116,7 @@
         typedef basic_expr proto_base_expr;
         typedef list1<Arg0> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -196,7 +196,7 @@
         typedef basic_expr proto_base_expr;
         typedef list2<Arg0 , Arg1> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -264,7 +264,7 @@
         typedef basic_expr proto_base_expr;
         typedef list3<Arg0 , Arg1 , Arg2> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -332,7 +332,7 @@
         typedef basic_expr proto_base_expr;
         typedef list4<Arg0 , Arg1 , Arg2 , Arg3> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -400,7 +400,7 @@
         typedef basic_expr proto_base_expr;
         typedef list5<Arg0 , Arg1 , Arg2 , Arg3 , Arg4> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -468,7 +468,7 @@
         typedef basic_expr proto_base_expr;
         typedef list6<Arg0 , Arg1 , Arg2 , Arg3 , Arg4 , Arg5> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -536,7 +536,7 @@
         typedef basic_expr proto_base_expr;
         typedef list7<Arg0 , Arg1 , Arg2 , Arg3 , Arg4 , Arg5 , Arg6> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -604,7 +604,7 @@
         typedef basic_expr proto_base_expr;
         typedef list8<Arg0 , Arg1 , Arg2 , Arg3 , Arg4 , Arg5 , Arg6 , Arg7> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -672,7 +672,7 @@
         typedef basic_expr proto_base_expr;
         typedef list9<Arg0 , Arg1 , Arg2 , Arg3 , Arg4 , Arg5 , Arg6 , Arg7 , Arg8> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
@@ -740,7 +740,7 @@
         typedef basic_expr proto_base_expr;
         typedef list10<Arg0 , Arg1 , Arg2 , Arg3 , Arg4 , Arg5 , Arg6 , Arg7 , Arg8 , Arg9> proto_args;
         typedef basic_expr proto_grammar;
-        typedef default_domain proto_domain;
+        typedef basic_default_domain proto_domain;
         typedef default_generator proto_generator;
         typedef proto::tag::proto_expr fusion_tag;
         typedef basic_expr proto_derived_expr;
Modified: branches/release/boost/proto/domain.hpp
==============================================================================
--- branches/release/boost/proto/domain.hpp	(original)
+++ branches/release/boost/proto/domain.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -200,6 +200,13 @@
           : domain<>
         {};
 
+        /// \brief A domain to use when you prefer the use of
+        /// \c proto::basic_expr\<\> over \c proto::expr\<\>.
+        ///
+        struct basic_default_domain
+          : domain<basic_default_generator>
+        {};
+
         /// \brief A pseudo-domain for use in functions and
         /// metafunctions that require a domain parameter. It
         /// indicates that the domain of the parent node should
Modified: branches/release/boost/proto/generate.hpp
==============================================================================
--- branches/release/boost/proto/generate.hpp	(original)
+++ branches/release/boost/proto/generate.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -72,6 +72,18 @@
         #include <boost/proto/detail/generate_by_value.hpp>
     }
 
+    /// \brief Annotate a generator to indicate that it would
+    /// prefer to be passed instances of \c proto::basic_expr\<\> rather
+    /// than \c proto::expr\<\>. <tt>use_basic_expr\<Generator\></tt> is
+    /// itself a generator.
+    ///
+    template<typename Generator>
+    struct use_basic_expr
+      : Generator
+    {
+        BOOST_PROTO_USE_BASIC_EXPR()
+    };
+
     /// \brief A simple generator that passes an expression
     /// through unchanged.
     ///
@@ -107,6 +119,19 @@
         }
     };
 
+    /// \brief A simple generator that passes an expression
+    /// through unchanged and specifies a preference for
+    /// \c proto::basic_expr\<\> over \c proto::expr\<\>.
+    ///
+    /// Generators are intended for use as the first template parameter
+    /// to the \c domain\<\> class template and control if and how
+    /// expressions within that domain are to be customized.
+    /// The \c default_generator makes no modifications to the expressions
+    /// passed to it.
+    struct basic_default_generator
+      : proto::use_basic_expr<default_generator>
+    {};
+    
     /// \brief A generator that wraps expressions passed
     /// to it in the specified extension wrapper.
     ///
@@ -307,18 +332,6 @@
         }
     };
 
-    /// \brief Annotate a generator to indicate that it would
-    /// prefer to be passed instances of \c proto::basic_expr\<\> rather
-    /// than \c proto::expr\<\>. <tt>use_basic_expr\<Generator\></tt> is
-    /// itself a generator.
-    ///
-    template<typename Generator>
-    struct use_basic_expr
-      : Generator
-    {
-        BOOST_PROTO_USE_BASIC_EXPR()
-    };
-
     /// \brief Tests a generator to see whether it would prefer
     /// to be passed instances of \c proto::basic_expr\<\> rather than
     /// \c proto::expr\<\>.
@@ -376,11 +389,23 @@
     };
 
     template<typename Expr>
+    struct result_of<proto::basic_default_domain(Expr)>
+    {
+        typedef Expr type;
+    };
+
+    template<typename Expr>
     struct result_of<proto::default_generator(Expr)>
     {
         typedef Expr type;
     };
 
+    template<typename Expr>
+    struct result_of<proto::basic_default_generator(Expr)>
+    {
+        typedef Expr type;
+    };
+
     #if BOOST_VERSION >= 104400
     template<typename Expr>
     struct tr1_result_of<proto::default_domain(Expr)>
@@ -389,10 +414,22 @@
     };
 
     template<typename Expr>
+    struct tr1_result_of<proto::basic_default_domain(Expr)>
+    {
+        typedef Expr type;
+    };
+
+    template<typename Expr>
     struct tr1_result_of<proto::default_generator(Expr)>
     {
         typedef Expr type;
     };
+
+    template<typename Expr>
+    struct tr1_result_of<proto::basic_default_generator(Expr)>
+    {
+        typedef Expr type;
+    };
     #endif
 }
 
Modified: branches/release/boost/proto/operators.hpp
==============================================================================
--- branches/release/boost/proto/operators.hpp	(original)
+++ branches/release/boost/proto/operators.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -34,7 +34,7 @@
           : boost::lazy_enable_if_c<
                 boost::mpl::and_<
                     Trait
-                  , lazy_matches<result_of::make_expr<Tag, default_domain, Arg &>, Grammar>
+                  , lazy_matches<result_of::make_expr<Tag, basic_default_domain, Arg &>, Grammar>
                 >::value
               , result_of::make_expr<Tag, Domain, Arg &>
             >
@@ -64,7 +64,7 @@
           : boost::lazy_enable_if_c<
                 boost::mpl::and_<
                     Trait
-                  , lazy_matches<result_of::make_expr<Tag, default_domain, Left &, Right &>, Grammar>
+                  , lazy_matches<result_of::make_expr<Tag, basic_default_domain, Left &, Right &>, Grammar>
                 >::value
               , result_of::make_expr<Tag, Domain, Left &, Right &>
             >
Modified: branches/release/boost/proto/proto_fwd.hpp
==============================================================================
--- branches/release/boost/proto/proto_fwd.hpp	(original)
+++ branches/release/boost/proto/proto_fwd.hpp	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -270,6 +270,8 @@
     ////////////////////////////////////////////////////////////////////////////////////////////////
     struct default_generator;
 
+    struct basic_default_generator;
+
     template<template<typename> class Extends>
     struct generator;
 
@@ -301,6 +303,8 @@
 
         struct default_domain;
 
+        struct basic_default_domain;
+
         struct deduce_domain;
 
         template<typename Domain, typename Tag, typename Args, bool WantsBasicExpr = wants_basic_expr<typename Domain::proto_generator>::value>
Modified: branches/release/libs/proto/doc/reference.xml
==============================================================================
--- branches/release/libs/proto/doc/reference.xml	(original)
+++ branches/release/libs/proto/doc/reference.xml	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -77,6 +77,16 @@
       </listitem>
       <listitem>
         <computeroutput>
+          <classname alt="boost::proto::basic_default_domain">proto::basic_default_domain</classname>
+        </computeroutput>
+      </listitem>
+      <listitem>
+        <computeroutput>
+          <classname alt="boost::proto::basic_default_generator">proto::basic_default_generator</classname>
+        </computeroutput>
+      </listitem>
+      <listitem>
+        <computeroutput>
           <classname alt="boost::proto::basic_expr">proto::basic_expr</classname>
         </computeroutput>
       </listitem>
Modified: branches/release/libs/proto/doc/reference/domain.xml
==============================================================================
--- branches/release/libs/proto/doc/reference/domain.xml	(original)
+++ branches/release/libs/proto/doc/reference/domain.xml	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -236,6 +236,13 @@
           to associate a domain with an expression.</purpose>
       </struct>
 
+      <!-- proto::basic_default_domain -->
+      <struct name="basic_default_domain">
+        <inherit><classname>proto::domain</classname>< <classname>proto::basic_default_generator</classname> ></inherit>
+        <purpose>A domain similiar in purpose to <classname>proto::default_domain</classname>, except stating
+        a preference for <classname>proto::basic_expr</classname><> over <classname>proto::expr</classname><>.</purpose>
+      </struct>
+
       <!-- proto::deduce_domain -->
       <struct name="deduce_domain">
         <purpose>A pseudo-domain for use in functions and metafunctions that require a domain parameter.
@@ -256,8 +263,14 @@
                 A sub-domain is <emphasis>stronger</emphasis> than its super-domain.
               </listitem>
               <listitem>
-                <computeroutput><classname>proto::default_domain</classname></computeroutput>
-                and all its sub-domains are <emphasis>weaker</emphasis> than all other domains.
+                <computeroutput><classname>proto::default_domain</classname></computeroutput>,
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>
+                and all their sub-domains are <emphasis>weaker</emphasis> than all other domains.
+              </listitem>
+              <listitem>
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>
+                is weaker than
+                <computeroutput><classname>proto::default_domain</classname></computeroutput>.
               </listitem>
               <listitem>
                 For each child, define a set of domains <emphasis>S<subscript>N</subscript></emphasis>
@@ -266,12 +279,14 @@
               <listitem>
                 Define a set <emphasis>I<subscript>S</subscript></emphasis> that is the intersection of
                 all the individual sets <emphasis>S<subscript>N</subscript></emphasis> that don't contain
-                <computeroutput><classname>proto::default_domain</classname></computeroutput>.
+                <computeroutput><classname>proto::default_domain</classname></computeroutput> or
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>.
               </listitem>
               <listitem>
                 Define a set <emphasis>I<subscript>W</subscript></emphasis> that is the intersection of
                 all the individual sets <emphasis>S<subscript>N</subscript></emphasis> that contain
-                <computeroutput><classname>proto::default_domain</classname></computeroutput>.
+                <computeroutput><classname>proto::default_domain</classname></computeroutput> or
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>.
               </listitem>
               <listitem>
                 Define a set <emphasis>P</emphasis> that is the union of
@@ -280,14 +295,16 @@
               </listitem>
               <listitem>
                 The common domain is the strongest domain in set <emphasis>P</emphasis>, with the
-                following caveat.
+                following caveats.
               </listitem>
               <listitem>
                 Let <emphasis>U</emphasis> be the union of all sets
                 <emphasis>S<subscript>N</subscript></emphasis>. If the result is 
-                <computeroutput><classname>proto::default_domain</classname></computeroutput>
+                <computeroutput><classname>proto::default_domain</classname></computeroutput> or
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>
                 and <emphasis>U</emphasis> contains an element that is <emphasis>not </emphasis>
-                <computeroutput><classname>proto::default_domain</classname></computeroutput>,
+                <computeroutput><classname>proto::default_domain</classname></computeroutput> or
+                <computeroutput><classname>proto::basic_default_domain</classname></computeroutput>,
                 it is an error.
               </listitem>
             </itemizedlist>
Modified: branches/release/libs/proto/doc/reference/expr.xml
==============================================================================
--- branches/release/libs/proto/doc/reference/expr.xml	(original)
+++ branches/release/libs/proto/doc/reference/expr.xml	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -68,7 +68,7 @@
         </typedef>
 
         <typedef name="proto_domain">
-          <type><classname>proto::default_domain</classname></type>
+          <type><classname>proto::basic_default_domain</classname></type>
         </typedef>
 
         <typedef name="proto_grammar">
Modified: branches/release/libs/proto/doc/reference/generate.xml
==============================================================================
--- branches/release/libs/proto/doc/reference/generate.xml	(original)
+++ branches/release/libs/proto/doc/reference/generate.xml	2011-05-19 06:18:15 EDT (Thu, 19 May 2011)
@@ -21,7 +21,7 @@
           </para>
         </description>
         <inherit>
-          <type>proto::callable</type>
+          <type><classname>proto::callable</classname></type>
         </inherit>
         <struct-specialization name="result">
           <template>
@@ -54,6 +54,17 @@
         </method-group>
       </struct>
 
+      <!-- proto::basic_default_generator -->
+      <struct name="basic_default_generator">
+        <purpose>
+          A simple generator that passes an expression through unchanged while stating
+          a preference for <classname>proto::basic_expr</classname><> over
+          <classname>proto::expr</classname><>.</purpose>
+        <inherit>
+          <type><classname>proto::use_basic_expr</classname>< <classname>proto::default_generator</classname> ></type>
+        </inherit>
+      </struct>
+
       <!-- proto::generator -->
       <struct name="generator">
         <template>