[Boost-users] compile error with Boost Function object and templated function (Intel C++ compiler)

From: Faheem Mitha (faheem_at_[hidden])
Date: 2006-08-29 15:31:24

Hi,

The following bit of code using Boost Function compiles fine with gcc
3.3 or later, but has problems with the Intel C++ compiler version
9.1, which produces the following error message.

Is this a compiler bug, or is there something wrong with the code?

If the former, I'd be grateful for suggestions of a workaround, and if
the latter, please tell me what I'm doing wrong.

Note that the corresponding version with no templates compiles without
problems.

Thanks in advance.                                            Faheem.

**************************************************************************

icpc -o foo.o -c -Wall -Werror -g -wd383,810,981,1418 cxxlib-icc
-DBOOST_RAND -I/usr/local/include/boost-1_33_1 \foo.cpp

foo.cpp(12): error: no operator "=" matches these operands operand
            types are: boost::function<int (), std::allocator<void>> =
            <unknown-type>
    choice = &rchoice<dim>;
           ^
*************************************************************
#include <boost/function.hpp>

template<int dim>
int rchoice()
{
  return 1;
}

template<int dim> int foo(void)
{
  boost::function<int ()> choice;
  choice = &rchoice<dim>;
  return choice();
}

int main()
{
  return foo<2>();
}
***************************************************************