add tr1_result_of that always behaves as TR1 specifies, fix Boost.TR1's result_of to use tr1_result_of

[SVN r61248]

include/boost/utility/detail/result_of_iterate.hpp

@@ -10,7 +10,30 @@
 # error Boost result_of - do not include this file!
 #endif
 
-#if defined(BOOST_HAS_DECLTYPE)
+// CWPro8 requires an argument in a function type specialization
+#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3002)) && BOOST_PP_ITERATION() == 0
+# define BOOST_RESULT_OF_ARGS void
+#else
+# define BOOST_RESULT_OF_ARGS BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)
+#endif
+
+#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
+         BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
+struct tr1_result_of<F(BOOST_RESULT_OF_ARGS)>
+    : mpl::if_<
+          mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
+        , boost::detail::tr1_result_of_impl<
+            typename remove_cv<F>::type, 
+            typename remove_cv<F>::type(BOOST_RESULT_OF_ARGS), 
+            (boost::detail::has_result_type<F>::value)>
+        , boost::detail::tr1_result_of_impl<
+            F,
+            F(BOOST_RESULT_OF_ARGS), 
+            (boost::detail::has_result_type<F>::value)> >::type { };
+#endif
+
+#if !defined(BOOST_NO_DECLTYPE) && defined(BOOST_RESULT_OF_USE_DECLTYPE)
 
 // As of N2588, C++0x result_of only supports function call
 // expressions of the form f(x). This precludes support for member
@@ -21,11 +44,11 @@ template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
 struct result_of<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
     : mpl::if_<
           mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
-        , detail::result_of_impl<
+        , detail::tr1_result_of_impl<
             typename remove_cv<F>::type, 
             typename remove_cv<F>::type(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), false
           >
-        , detail::result_of_decltype_impl<
+        , detail::cpp0x_result_of_impl<
               F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))
           >
       >::type
@@ -39,7 +62,7 @@ namespace detail {
 
 template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-class result_of_decltype_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
+class cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T))>
 {
   static F f;
   BOOST_PP_REPEAT(BOOST_PP_ITERATION(), BOOST_RESULT_OF_STATIC_MEMBERS, _)
@@ -51,47 +74,31 @@ public:
 
 #else // defined(BOOST_NO_DECLTYPE)
 
-// CWPro8 requires an argument in a function type specialization
-#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3002)) && BOOST_PP_ITERATION() == 0
-# define BOOST_RESULT_OF_ARGS void
-#else
-# define BOOST_RESULT_OF_ARGS BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)
-#endif
-
 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
 template<typename F BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
 struct result_of<F(BOOST_RESULT_OF_ARGS)>
-    : mpl::if_<
+    : tr1_result_of<F(BOOST_RESULT_OF_ARGS)> { };
-          mpl::or_< is_pointer<F>, is_member_function_pointer<F> >
-        , boost::detail::result_of_impl<
-            typename remove_cv<F>::type, 
-            typename remove_cv<F>::type(BOOST_RESULT_OF_ARGS), 
-            (boost::detail::has_result_type<F>::value)>
-        , boost::detail::result_of_impl<
-            F,
-            F(BOOST_RESULT_OF_ARGS), 
-            (boost::detail::has_result_type<F>::value)> >::type { };
 #endif
 
-#undef BOOST_RESULT_OF_ARGS
-
 #endif // defined(BOOST_NO_DECLTYPE)
 
+#undef BOOST_RESULT_OF_ARGS
+
 #if BOOST_PP_ITERATION() >= 1 
 
 namespace detail {
 
 template<typename R,  typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
+struct tr1_result_of_impl<R (*)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
 {
   typedef R type;
 };
 
 template<typename R,  typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
+struct tr1_result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs, false>
 {
   typedef R type;
 };
@@ -99,7 +106,7 @@ struct result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), FArgs
 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                      (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)),
                  FArgs, false>
 {
@@ -108,7 +115,7 @@ struct result_of_impl<R (T0::*)
 
 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                      (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                      const,
                  FArgs, false>
@@ -118,7 +125,7 @@ struct result_of_impl<R (T0::*)
 
 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                      (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                      volatile,
                  FArgs, false>
@@ -128,7 +135,7 @@ struct result_of_impl<R (T0::*)
 
 template<typename R, typename FArgs BOOST_PP_COMMA_IF(BOOST_PP_ITERATION())
          BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)>
-struct result_of_impl<R (T0::*)
+struct tr1_result_of_impl<R (T0::*)
                      (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T))
                      const volatile,
                  FArgs, false>

include/boost/utility/result_of.hpp

@@ -30,14 +30,15 @@
 namespace boost {
 
 template<typename F> struct result_of;
+template<typename F> struct tr1_result_of; // a TR1-style implementation of result_of
 
 #if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 namespace detail {
 
 BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
 
-template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;
+template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;
-template<typename F> struct result_of_decltype_impl;
+template<typename F> struct cpp0x_result_of_impl;
 
 template<typename F>
 struct result_of_void_impl
@@ -60,10 +61,10 @@ struct result_of_void_impl<R (&)(void)>
 // Determine the return type of a function pointer or pointer to member.
 template<typename F, typename FArgs>
 struct result_of_pointer
-  : result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
+  : tr1_result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
 
 template<typename F, typename FArgs>
-struct result_of_impl<F, FArgs, true>
+struct tr1_result_of_impl<F, FArgs, true>
 {
   typedef typename F::result_type type;
 };
@@ -79,7 +80,7 @@ struct result_of_nested_result : F::template result<FArgs>
 {};
 
 template<typename F, typename FArgs>
-struct result_of_impl<F, FArgs, false>
+struct tr1_result_of_impl<F, FArgs, false>
   : mpl::if_<is_function_with_no_args<FArgs>,
              result_of_void_impl<F>,
              result_of_nested_result<F, FArgs> >::type

test/result_of_test.cpp

@@ -5,6 +5,8 @@
 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt)
 
+#define BOOST_RESULT_OF_USE_DECLTYPE
+
 // For more information, see http://www.boost.org/libs/utility
 #include <boost/utility/result_of.hpp>
 #include <utility>
@@ -131,6 +133,18 @@ int main()
   BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(double)>::type, int>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of_template<void>(double)>::type, int>::value));
 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type(float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const int_result_of(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_template<void>(float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of_template<void>(double)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const int_result_of_template<void>(double)>::type, int>::value));
+
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile int_result_of(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_of_template<void>(void)>::type, void>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile int_result_of_template<void>(void)>::type, void>::value));
+
   // Prior to decltype, result_of could not deduce the return type
   // nullary function objects unless they exposed a result_type.
 #if !defined(BOOST_NO_DECLTYPE)
@@ -145,6 +159,9 @@ int main()
   BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, void>::value));
 #endif
 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_and_float_result_of_and_char_return(char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<int_result_type_and_float_result_of_and_char_return_template<void>(char)>::type, int>::value));
+
   // Prior to decltype, result_of ignored a nested result<> if
   // result_type was defined. After decltype, result_of deduces the
   // actual return type of the function object, ignoring both
@@ -168,6 +185,17 @@ int main()
   BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_0(X)>::type, int>::value)); 
   BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(void)>::type, int>::value));
 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr(char, float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ref(char, float)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr_0()>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ref_0()>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_c(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_v(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_cv(X,char)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<mem_func_ptr_0(X)>::type, int>::value)); 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<func_ptr(void)>::type, int>::value));
+
   BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(double)>::type, double>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<const result_of_member_function_template(double)>::type, const double>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value));
@@ -177,10 +205,22 @@ int main()
   BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int volatile &, int)>::type, int volatile &>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<result_of_member_function_template(int const volatile &, int)>::type, int const volatile &>::value));
 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(double)>::type, double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const result_of_member_function_template(double)>::type, const double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<volatile result_of_member_function_template(double)>::type, volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<const volatile result_of_member_function_template(double)>::type, const volatile double>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int &, int)>::type, int &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int const &, int)>::type, int const &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int volatile &, int)>::type, int volatile &>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<result_of_member_function_template(int const volatile &, int)>::type, int const volatile &>::value));
+
   typedef int (*pf_t)(int);
   BOOST_STATIC_ASSERT((is_same<result_of<pf_t(int)>::type, int>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<pf_t const(int)>::type,int>::value));
 
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<pf_t(int)>::type, int>::value));
+  BOOST_STATIC_ASSERT((is_same<tr1_result_of<pf_t const(int)>::type,int>::value));
+
 #if !defined(BOOST_NO_DECLTYPE)
   BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(double)>::type, int>::value));
   BOOST_STATIC_ASSERT((is_same<result_of<no_result_type_or_result_of(void)>::type, unsigned int>::value));