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Showing content from https://cplusplus.com/reference/functional/reference_wrapper/operator=/ below:

public member function

<functional>

std::reference_wrapper::operator= 
reference_wrapper& operator= (const reference_wrapper& rhs) noexcept;

Copy assignment

Copies the reference held by rhs, replacing the reference currently held in *this.

After the call, both rhs and *this refer to the same object or function.



Parameters
rhs
A reference_wrapper object of the same type (i.e., with the same template parameter, T).

Return value*this
Example 
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// reference_wrapper::operator=
#include <iostream>     // std::cout
#include <functional>   // std::reference_wrapper

int main () {
  int a,b;

  // reference_wrapper assignment:
  a=10; b=20;
  std::reference_wrapper<int> wrap1 (a);
  std::reference_wrapper<int> wrap2 (b);

  wrap1 = wrap2;
  ++wrap1; ++wrap2;

  std::cout << "a: " << a << '\n';
  std::cout << "b: " << b << '\n';

  std::cout << '\n';

  // note the difference with:
  a=10; b=20;
  int& ref1 (a);
  int& ref2 (b);

  ref1 = ref2;
  ++ref1; ++ref2;

  std::cout << "a: " << a << '\n';
  std::cout << "b: " << b << '\n';

  return 0;
}

Output:


Data races The object is modified.
The object acquires a reference to the element referred by rhs (rhs.get()), which can be used to access or modify it.

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

See also
ref
Construct reference_wrapper (function template)
cref
Construct reference_wrapper to const (function template)
reference_wrapper::reference_wrapper
Construct reference wrapper (public member function)
reference_wrapper::get
Access element (public member function)

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