[Boost-users] [mpl, enable_if] "Failed to specialize function template"

Subject: [Boost-users] [mpl, enable_if] "Failed to specialize function template"
From: Igor R (boost.lists_at_[hidden])
Date: 2010-12-14 10:59:06

Hello,

The following code fails to compile (MSVC10, Boost 1.45) with "error
C2893: Failed to specialize function template..."
It seems that the compiler tries to evaluate mpl::apply, doesn't it?

#include <boost/mpl/apply.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/or.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/always.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/utility/enable_if.hpp>

using namespace boost::mpl;
using boost::is_same;

template<typename Type>
void test(Type,
  typename boost::enable_if
  <
    and_
    <
      not_<boost::is_same<Type, int> >,
      apply<always<true_>, typename Type::my_type>
    >
  >::type* dummy = 0)
{
}

template<typename Type>
void test(Type,
  typename boost::disable_if
  <
    and_
    <
      not_<boost::is_same<Type, int> >,
      apply<always<true_>, typename Type::my_type>
    >
  >::type* dummy = 0)
{
}

int main(int argc, char* argv[])
{
  test(int());
  return 0;
}