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An object of the class cpp0x::tuple<...> represents a heterogeneous tuple of elements of the types specified in parameters, which are in variadic number.
There is actually no class in namespace CGAL::cpp0x with this name, but a using declaration which imports a class from another namespace. By order of priority: the one in namespace std is used (provided by C++0x), if not found, then the one in namespace std::tr1 is used (provided by TR1), and finally, the fallback solution is taken from Boost.
#include <CGAL/tuple.h>
The parameters ... are the value types.
Some free functions part of the standard interface of tuple are also brought in namespace CGAL::cpp0x with using declarations, these are make_tuple, get, tie. Two standard helper classes are also provided for convenience (tuple_size and tuple_element).