How to pass modified Template argument to sub module?

I have a top level module with template like this:

template <int TOP_DEPTH=10>
SC_MODULE(my_top){}

And I have several sub modules like this:

template <int DEPTH=10>
SC_MODULE(sub_module_xxx>

I try to instantiate sub modules with the modified DEPTH from top level:

const int DEPTH_MODULE_A = <math1 on TOP_DEPTH>
const int DEPTH_MODULE_B = <math2 on TOP_DEPTH>
...

sub_module_a<DEPTH_MODULE_A> *pSubModuleA;
sub_module_b<DEPTH_MODULE_B> *pSubModuleB;
...

I got compile error about  "invalid use of non-static data member". 

I am not sure what's the right way to do it in C++. 

(I don't want DEPTH_MODULE_xxx to be static, because my top_module may be used as submodule in other project with different value of TOP_DEPTH. )