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Showing content from https://cplusplus.com/reference/tuple/tie/ below:

function template

<tuple>

std::tie 
template<class... Types>  tuple<Types&...> tie (Types&... args) noexcept;
template<class... Types>  constexpr tuple<Types&...> tie (Types&... args) noexcept;

Tie arguments to tuple elements

Constructs a tuple object whose elements are references to the arguments in args, in the same order.

This allows a set of objects to act as a tuple, which is especially useful to unpack tuple objects.

The special constant ignore can be used to specify elements of a tuple to be ignored instead of tied to a specific object.



Parameters
args
List of objects (lvalues) to be tied as elements of a tuple.

Return Value A tuple with lvalue references to args.

Example 
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// packing/unpacking tuples
#include <iostream>     // std::cout
#include <tuple>        // std::tuple, std::make_tuple, std::tie

int main ()
{
  int myint;
  char mychar;

  std::tuple<int,float,char> mytuple;

  mytuple = std::make_tuple (10, 2.6, 'a');          // packing values into tuple

  std::tie (myint, std::ignore, mychar) = mytuple;   // unpacking tuple into variables

  std::cout << "myint contains: " << myint << '\n';
  std::cout << "mychar contains: " << mychar << '\n';

  return 0;
}

Output: 
myint contains: 10
mychar contains: a


Data races None introduced by this call.
Notice though that the arguments may be modified by any use of the returned object.

Exception safetyNo-throw guarantee: this function never throws exceptions.

See also
make_tuple
Construct tuple (function template)
forward_as_tuple
Forward as tuple (function template)
get
Get element (function template)

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