Cuda Thrust String or Char Sort - c++

Question

I am trying to sort string with cuda thrust .
I found a sample on this link
https://github.com/bzip2-cuda/bzip2-cuda/blob/master/tst/string_sort_try0.cu
when i try to compile i get the following error message. What can I do to fix it?
"Error 1 error : **no instance of overloaded function "thrust::pointer<Element, Tag, Reference, Derived>::operator= [with Element=char, Tag=thrust::device_system_tag, Reference=thrust::device_reference<char>, Derived=thrust::device_ptr<char>]" matches the argument list** C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\include\thrust\device_ptr.h 109 1 CharSort "
a part of code block is
class device_string
{
public:
int cstr_len;
char* raw;
thrust::device_ptr<char> cstr;
static char* pool_raw;
static thrust::device_ptr<char> pool_cstr;
static thrust::device_ptr<char> pool_top;
// Sets the variables up the first time its used.
__host__ static void init()
{
static bool v = true;
if( v )
{
v = false;
pool_cstr = thrust::device_malloc(POOL_SZ);
pool_raw = (char*)raw_pointer_cast( pool_cstr );
pool_top = pool_cstr;
}
}
// Destructor for device variables used.

Answer 1

You can work around that particular issue by changing this line of code:
pool_cstr = thrust::device_malloc(POOL_SZ);
to this:
pool_cstr = thrust::device_malloc<char>(POOL_SZ);
But as #Eric indicates, once you fix that you will run into other issues trying to compile this code.
EDIT: Actually the remaining problems appear to be all warnings, and an executable is produced which seems to run correctly (with the above fix).