1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <valarray>
11
12 // template<class T> class valarray;
13
14 // template<class T>
15 // valarray<T>
16 // pow(const valarray<T>& x, const valarray<T>& y);
17
18 #include <valarray>
19 #include <cassert>
20 #include <sstream>
21
is_about(double x,double y,int p)22 bool is_about(double x, double y, int p)
23 {
24 std::ostringstream o;
25 o.precision(p);
26 scientific(o);
27 o << x;
28 std::string a = o.str();
29 o.str("");
30 o << y;
31 return a == o.str();
32 }
33
main()34 int main()
35 {
36 {
37 typedef double T;
38 T a1[] = {.9, .5, 0., .5, .75};
39 T a2[] = {-.8, .25, 0.375, -.5, .75};
40 T a3[] = {1.0879426248455297e+00,
41 8.4089641525371450e-01,
42 0.0000000000000000e+00,
43 1.4142135623730949e+00,
44 8.0592744886765644e-01};
45 const unsigned N = sizeof(a1)/sizeof(a1[0]);
46 std::valarray<T> v1(a1, N);
47 std::valarray<T> v2(a2, N);
48 std::valarray<T> v3 = pow(v1, v2);
49 assert(v3.size() == v1.size());
50 for (int i = 0; i < v3.size(); ++i)
51 assert(is_about(v3[i], a3[i], 10));
52 }
53 }
54