Can one access the template parameter outside of a template without a typedef?

Question

A simple example:

template // this template parameter should be usable outside!
struct Small {
   typedef _X X; // this is tedious!
   X f         


        

Answer 1

Depending on what you're doing, template template parameters might be a better option:

// "typename X" is a template type parameter. It accepts a type.
// "template  class SomeSmall" is a template template parameter.
// It accepts a template that accepts a single type parameter.
template class SomeSmall> 
struct Big {
   SomeSmall bar; // We pass X to the SomeSmall template.
   X toe; // X is available to this template.
}; 

// Usage example:

template
struct Small { 
   X foo; 
};

struct MyType {};

// The foo member in Small will be of type MyType.
Big big;