Tuple creation functions

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#### Tuple creation functions

###### Description

TR1 describes 2 utility functions for creating _tr1tuple_s. `make_tuple` builds a tuple out of it's argument list, and `tie` builds a tuple of references to it's arguments. The details of these creation functions are described in this section.

###### Specification

    template<typename T1, typename T2, ..., typename TN>
    tuple<V1, V2, ..., VN> make_tuple(const T1& t1, const T2& t2, ..., const TN& tn);

Where `Vi` is `X&` if the cv-unqualified type `Ti` is `reference_wrapper<X>`, otherwise `Vi` is `Ti`.

Returns: `tuple<V1, V2, ..., VN>(t1, t2, ..., tN)`

    template<typename T1, typename T2, ..., typename TN>
    tuple<T1&, T2&, ..., TN&> tie(T1& t1, T2& t2, ..., TN& tn);

Returns: tuple<T1&, T2&, ..., TN&>(t1, t2, ..., tN). When argument `ti` is `ignore`, assigning any value to the corresponding tuple element has has no effect.