Remove all elements in a valarray
/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <iostream> #include <valarray> using namespace std; // print valarray template <class T> void printValarray (const valarray<T>& va) { for (int i=0; i<va.size(); i++) { cout << va[i] << ' '; } cout << endl; } int main() { // define two valarrays with ten elements valarray<double> va1(10), va2(10); // assign values 0.0, 1.1, up to 9.9 to the first valarray for (int i=0; i<10; i++) { va1[i] = i * 1.1; } // assign values of the first to the second valarray va2 = va1; // remove all elements of the first valarray va1.resize(0); // print both valarrays again printValarray(va1); printValarray(va2); } /* 0 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 */