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 #include <cstddef> 22 23 bool is_about(double x, double y, int p) 24 { 25 std::ostringstream o; 26 o.precision(p); 27 scientific(o); 28 o << x; 29 std::string a = o.str(); 30 o.str(""); 31 o << y; 32 return a == o.str(); 33 } 34 35 int main() 36 { 37 { 38 typedef double T; 39 T a1[] = {.9, .5, 0., .5, .75}; 40 T a2[] = {-.8, .25, 0.375, -.5, .75}; 41 T a3[] = {1.0879426248455297e+00, 42 8.4089641525371450e-01, 43 0.0000000000000000e+00, 44 1.4142135623730949e+00, 45 8.0592744886765644e-01}; 46 const unsigned N = sizeof(a1)/sizeof(a1[0]); 47 std::valarray<T> v1(a1, N); 48 std::valarray<T> v2(a2, N); 49 std::valarray<T> v3 = pow(v1, v2); 50 assert(v3.size() == v1.size()); 51 for (std::size_t i = 0; i < v3.size(); ++i) 52 assert(is_about(v3[i], a3[i], 10)); 53 } 54 } 55
