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// tan(const valarray<T>& x); 17 18#include <valarray> 19#include <cassert> 20#include <sstream> 21 22bool 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 34int main() 35{ 36 { 37 typedef double T; 38 T a1[] = {-.9, -.5, 0., .5, .75}; 39 T a3[] = {-1.2601582175503390e+00, 40 -5.4630248984379048e-01, 41 0.0000000000000000e+00, 42 5.4630248984379048e-01, 43 9.3159645994407259e-01}; 44 const unsigned N = sizeof(a1)/sizeof(a1[0]); 45 std::valarray<T> v1(a1, N); 46 std::valarray<T> v3 = tan(v1); 47 assert(v3.size() == v1.size()); 48 for (int i = 0; i < v3.size(); ++i) 49 assert(is_about(v3[i], a3[i], 10)); 50 } 51} 52