Using an int as a template parameter that is not known until run-time

Question

I am trying to use an integer as a template parameter for a class. Here is a sample of the code:

template< int array_qty > 
class sample_class {

    p         


        

Answer 1

Template arguments must be compile-time constants aka "constant expressions" or constexprs for short. So there is no way to do is using templates.

You could use a dynamic-sized array and store its size in an int.

Or simply use a vector. Be sure to initialize its size in the constructor by passing the desired size to the vector's constructor!