The following trivial use of boost::result_of fails on msvc-7.1 and msvc-8.0: #include <boost/utility/result_of.hpp> template<typename T> struct function { template<typename Sig> struct result; template<typename This, typename U> struct result<This(U)> { typedef U type; }; }; int main() { boost::result_of<function<void>(int)>::type i = 0; return 0; } The attached patch works around the problem. (Yes, I've reported this to Microsoft.) I've also added some additional test cases to catch this problem (see result_of_test.cpp attached). I've confirmed the tests pass on msvc-7.1, msvc-8.0, gcc-3.4, gcc-4.0 and gcc-4.1. The following compilers should also be tested, but I don't have access to them. Can anybody help out? gcc-3.3 cw-9.4 intel-* sun-5.8 qcc-* hp_cxx_* acc Any help is much appreciated. -- Eric Niebler Boost Consulting www.boost-consulting.com // Boost result_of library // Copyright Douglas Gregor 2003-2004. Use, modification and // distribution is subject to 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 http://www.boost.org/libs/utility #include <boost/utility/result_of.hpp> #include <utility> #include <boost/static_assert.hpp> #include <boost/type_traits/is_same.hpp> struct int_result_type { typedef int result_type; }; struct int_result_of { template<typename F> struct result { typedef int type; }; }; struct int_result_type_and_float_result_of { typedef int result_type; template<typename F> struct result { typedef float type; }; }; template<typename T> struct int_result_type_template { typedef int result_type; }; template<typename T> struct int_result_of_template { template<typename F> struct result; template<typename This, typename That> struct result<This(That)> { typedef int type; }; }; template<typename T> struct int_result_type_and_float_result_of_template { typedef int result_type; template<typename F> struct result; template<typename This, typename That> struct result<This(That)> { typedef float type; }; }; struct X {}; int main() { using namespace boost; typedef int (*func_ptr)(float, double); typedef int (&func_ref)(float, double); typedef int (X::*mem_func_ptr)(float); typedef int (X::*mem_func_ptr_c)(float) const; typedef int (X::*mem_func_ptr_v)(float) volatile; typedef int (X::*mem_func_ptr_cv)(float) const volatile; BOOST_STATIC_ASSERT((is_same<result_of<int_result_type(float)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(double)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_of(void)>::type, void>::value)); BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of(double)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of(void)>::type, void>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of(char)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_template<void>(float)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(double)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_of_template<void>(void)>::type, void>::value)); BOOST_STATIC_ASSERT((is_same<result_of<const int_result_of_template<void>(double)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<volatile int_result_of_template<void>(void)>::type, void>::value)); BOOST_STATIC_ASSERT((is_same<result_of<int_result_type_and_float_result_of_template<void>(char)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<func_ptr(char, float)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<func_ref(char, float)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr(X,char)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_c(X,char)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_v(X,char)>::type, int>::value)); BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr_cv(X,char)>::type, int>::value)); return 0; } ? result_of_patch.txt Index: result_of.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/utility/result_of.hpp,v retrieving revision 1.7 diff -b -d -u -r1.7 result_of.hpp --- result_of.hpp 16 May 2006 22:55:27 -0000 1.7 +++ result_of.hpp 7 Jan 2007 05:16:46 -0000 @@ -29,28 +29,25 @@ BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type) -template<typename F, typename FArgs, bool HasResultType> struct get_result_of; +template<typename F, typename FArgs, bool HasResultType> struct result_of_impl; template<typename F, typename FArgs> -struct get_result_of<F, FArgs, true> +struct result_of_impl<F, FArgs, true> { typedef typename F::result_type type; }; template<typename F, typename FArgs> -struct get_result_of<F, FArgs, false> +struct result_of_impl<F, FArgs, false> : F::template result<FArgs> {}; template<typename F> -struct get_result_of<F, F(void), false> +struct result_of_impl<F, F(void), false> { typedef void type; }; -template<typename F, typename FArgs> -struct result_of_impl : get_result_of<F, FArgs, (has_result_type<F>::value)> {}; - } // end namespace detail #define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>)) Index: detail/result_of_iterate.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/utility/detail/result_of_iterate.hpp,v retrieving revision 1.3 diff -b -d -u -r1.3 result_of_iterate.hpp --- detail/result_of_iterate.hpp 16 May 2006 22:55:26 -0000 1.3 +++ detail/result_of_iterate.hpp 7 Jan 2007 05:16:46 -0000 @@ -21,21 +21,21 @@ 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)> - : detail::result_of_impl<F, F(BOOST_RESULT_OF_ARGS)> {}; + : detail::result_of_impl<F, F(BOOST_RESULT_OF_ARGS), (detail::has_result_type<F>::value)> {}; #endif 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_RESULT_OF_ARGS), FArgs> +struct result_of_impl<R (*)(BOOST_RESULT_OF_ARGS), 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_RESULT_OF_ARGS), FArgs> +struct result_of_impl<R (&)(BOOST_RESULT_OF_ARGS), FArgs, false> { typedef R type; }; @@ -47,7 +47,7 @@ BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),typename T)> struct result_of_impl<R (T0::*) (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)), - FArgs> + FArgs, false> { typedef R type; }; @@ -57,7 +57,7 @@ struct result_of_impl<R (T0::*) (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)) const, - FArgs> + FArgs, false> { typedef R type; }; @@ -67,7 +67,7 @@ struct result_of_impl<R (T0::*) (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)) volatile, - FArgs> + FArgs, false> { typedef R type; }; @@ -77,7 +77,7 @@ struct result_of_impl<R (T0::*) (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)) const volatile, - FArgs> + FArgs, false> { typedef R type; };