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Showing content from https://cplusplus.com/valarray::resize below:

public member function

<valarray>

std::valarray::resize 
void resize (size_t sz, T c = T());

Resize valarray

Resizes the valarray, changing its size to sz elements, and assigns the value c to each element.

After resizing, the previous contents are lost: the valarray will contain sz elements, all of them with a value of c.

All pointers and references to elements of the valarray are invalidated by the call.



Parameters
sz
Size of the valarray, in terms of the number of elements.
size_t is an unsigned integral type.
c
Value to be assigned to each of the elements of the resized array.
T is the template argument of valarray (the value type).

Return value none

Example 
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// valarray::resize example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <valarray>     // std::valarray

int increment (int x) {return ++x;}

int main ()
{
  std::valarray<int> myarray (10,5);   // 10 10 10 10 10
  myarray.resize(3);                   // 0  0  0

  std::cout << "myvalarray contains:";
  for (std::size_t n=0; n<myarray.size(); n++)
	  std::cout << ' ' << myarray[n];
  std::cout << '\n';

  return 0;
}

Output: 
myvalarray contains: 0 0 0


Complexity Depends on library implementation (operations may be parallelized).

Iterator validity Invalidates all iterators, references and sub-arrays of the valarray.

Data races The valarray and all its elements are modified.

Exception safety If any operation performed on the elements throws an exception, it causes undefined behavior.
If the function needs to allocate storage and fails, it may throw an exception (such as bad_alloc), although this is not mandated.

See also
valarray::size
Return size (public member function)
valarray::valarray
valarray constructor (public member function)
valarray::operator=
Assign content (public member function)

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