Re: [boost] [result_of] msvc work-around -- TESTERS NEEDED

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-01-13 19:11:50

Hi,

here is how it breaks.

Let's start with the new bug:

1.

     typedef int (*func_ptr_0)();

     BOOST_STATIC_ASSERT((is_same<
         result_of<func_ptr_0()>::type,
         int>::value));

==> Ambiguous template specialization, this one got introduced by Eric's 
workaround

2.

Although it seems to be the same problem, it's actually a different one 
(just a typo - see result_of_iterate.patch). This test fails with the RC 
1.34 version, too:

     typedef int (X::*mem_func_ptr_0)();

     BOOST_STATIC_ASSERT((is_same<
         result_of<mem_func_ptr_0(X)>::type,
         int>::value));

Regards,
Tobias

Index: boost/utility/detail/result_of_iterate.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/utility/detail/result_of_iterate.hpp,v
retrieving revision 1.4
diff -u -r1.4 result_of_iterate.hpp
--- boost/utility/detail/result_of_iterate.hpp	8 Jan 2007 20:38:51 -0000	1.4
+++ boost/utility/detail/result_of_iterate.hpp	13 Jan 2007 23:55:08 -0000
@@ -42,7 +42,7 @@
 
 #undef BOOST_RESULT_OF_ARGS
 
-#if BOOST_PP_ITERATION() > 1 && !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+#if BOOST_PP_ITERATION() >= 1 && !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::*)


// 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; };
};

struct X {};

int main()
{
  using namespace boost;

  typedef int (*func_ptr)(float, double);
  typedef int (*func_ptr_0)();
  typedef int (&func_ref)(float, double);
  typedef int (*func_ref_0)();
  typedef int (X::*mem_func_ptr)(float);
  typedef int (X::*mem_func_ptr_0)();
  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<func_ptr(char, float)>::type, int>::value));
//  BOOST_STATIC_ASSERT((is_same<result_of<func_ptr_0()>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<result_of<func_ref(char, float)>::type, int>::value));
//  BOOST_STATIC_ASSERT((is_same<result_of<func_ref_0()>::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_0(X)>::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;
}