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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <valarray>
// template<class T> class valarray;
// template<class T>
// valarray<T>
// pow(const T& x, const valarray<T>& y);
#include <valarray>
#include <cassert>
#include <sstream>
bool is_about(double x, double y, int p)
{
std::ostringstream o;
o.precision(p);
scientific(o);
o << x;
std::string a = o.str();
o.str("");
o << y;
return a == o.str();
}
int main()
{
{
typedef double T;
T a1[] = {.9, .5, 0., .5, .75};
T a3[] = {1.8660659830736148e+00,
1.4142135623730951e+00,
1.0000000000000000e+00,
1.4142135623730951e+00,
1.6817928305074290e+00};
const unsigned N = sizeof(a1)/sizeof(a1[0]);
std::valarray<T> v1(a1, N);
std::valarray<T> v3 = pow(2.0, v1);
assert(v3.size() == v1.size());
for (int i = 0; i < v3.size(); ++i)
assert(is_about(v3[i], a3[i], 10));
}
}
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