valarray.cpp

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#include <cstddef>      // for size_t
#include <iostream>     // for cout
#include <valarray>     // for valarray
 
#include <examples.h>
 
 
template <class T> 
inline std::ostream&
operator<< (std::ostream &out, const std::valarray<T> &v)
{
    out << '[';
 
    for (std::size_t i = 0; i < v.size (); ++i) {
        out << v [i];
        if (i < v.size () - 1)
            out << ',';
    }
 
    return out << ']';
}
 
 
int main ()
{
    const int ibuf[]  = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };  
    const int ibuf2[] = { 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };  
 
    // create 2 valarrays of ints
    std::valarray<int> vi (ibuf, sizeof ibuf / sizeof *ibuf);
    std::valarray<int> vi2 (ibuf2, sizeof ibuf2 / sizeof *ibuf2);
 
    // print them out
    std::cout << vi << '\n' << vi2 << '\n';
 
    vi += vi2;
    vi2 *= 2;
 
    std::valarray<int> vi3 = vi2 % vi;
 
    // print them out again
    std::cout << vi << '\n' << vi2 << '\n' << vi3 << '\n';
 
    return 0;
}