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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_valarray_operator.htm below:

C++ valarray Operators

It assigns contents to the valarray object.

Following is the declaration for std::valarray::operator= function.

valarray& operator=(const valarray& x);

valarray& operator=(const valarray& x);

• x − It is a valarray object of the same type.

• val − A value assigned to all the elements are in the valarray.

• x − The result of a valarray subscripting operation.

It returns *this.

Basic guarantee − if any operation performed on the elements throws an exception.

All elements effectively copied are accessed.

In below example explains about std::valarray::operator= function.

#include <iostream>
#include <valarray>

int main () {

   std::valarray<int> foo (10);
   std::valarray<int> bar (2,40);

   foo = bar;
   bar = 5;
   foo = bar[std::slice (0,4,1)];

   std::cout << "foo sums " << foo.sum() << '\n';

   return 0;
}

Let us compile and run the above program, this will produce the following result −

foo sums 92

valarray.htm

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