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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 I
th
element of T
. Equivalent
to
.
result_of::value_at
<I,T>::type