Difference of keywords 'typename' and 'class' in templates?

Question

For templates I have seen both declarations:

template < typename T >
template < class T >

What\'s the difference?

And

Answer 1

While there is no technical difference, I have seen the two used to denote slightly different things.

For a template that should accept any type as T, including built-ins (such as an array )

template
class Foo { ... }

For a template that will only work where T is a real class.

template
class Foo { ... }

But keep in mind that this is purely a style thing some people use. Not mandated by the standard or enforced by compilers