Re: [Boost-users] [ptr_container] compiler error with BOOST_RESULT_OF_USE_DECLTYPE

1 Mar 2011

      A similar error happens even with tr1 result_of (i.e. without defining
BOOST_RESULT_OF_USE_DECLTYPE).
Minimal test case (fails to be compiled):

    #include 

    template <typename T>
    struct my_less
    {
       bool operator()(T const& t1, T const& t2) const { return t1 < t2; }

       template <typename Sig> struct result;
       template 
       struct result
       {
           typedef bool type;
       };
    };

    int main (int argc, char* argv[])
    {
        boost::void_ptr_indirect_fun f;

        return 0;
    }

The error occurred in the code (at line 105 of ptr_container/indirect_fun.hpp)
which determines the return type of unary function call operator of
class boost::void_ptr_indirect_fun:

    result_of::type operator()( const void* r ) const {...}

Since result_of only works with two function parameters,
this code does not compile.

These issues, including OP's one, can be fixed by removing unary function call
operator of class boost::void_ptr_indirect_fun (i.e. making it BinaryFunction).

Hope this helps,
Michel

Re: [Boost-users] [ptr_container] compiler error with BOOST_RESULT_OF_USE_DECLTYPE

Michel MORIN