#include <deque>

template <class T>
class SomeClass {
	typedef std::deque<T> the_deque;
	typedef the_deque::iterator the_iterator;
};

## GCC error (i686-apple-darwin9-g++-4.0.1)

d.cpp:6: error: type 'std::deque<T, std::allocator<_CharT> >' is not derived from type 'SomeClass<T>'
d.cpp:6: error: expected ';' before 'the_iterator'

## Solution after tinkering in an hour and a half

Add “typename” after the second typedef keyword.