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The TR1 Tuple provides 2 helper traits, for compile time access to the tuple size, and the element types.
tuple_size<T>::value
Requires: T
is any fusion sequence type, including tuple.
Type: MPL Integral Constant
Value: The number of elements in the sequence.
Equivalent to .
result_of::size<T>::type
tuple_element<I, T>::type
Requires: T
is any fusion sequence type, including tuple.
0 <=
I <
N or the program is ill formed.
Value: The type of the Ith
element of T. Equivalent
to .
result_of::value_at<I,T>::type