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56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <valarray>
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// template<class T> class valarray;
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// template<class T>
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// valarray<T>
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// log(const valarray<T>& x);
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#include <valarray>
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#include <cassert>
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#include <sstream>
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#include <cstddef>
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#include "test_macros.h"
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bool is_about(double x, double y, int p)
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{
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std::ostringstream o;
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o.precision(p);
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scientific(o);
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o << x;
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std::string a = o.str();
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o.str("");
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o << y;
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return a == o.str();
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}
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int main(int, char**)
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{
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{
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typedef double T;
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T a1[] = {.5, .75, 1, 3, 7};
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T a3[] = {-6.9314718055994529e-01,
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-2.8768207245178090e-01,
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0.0000000000000000e+00,
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1.0986122886681098e+00,
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1.9459101490553132e+00};
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const unsigned N = sizeof(a1)/sizeof(a1[0]);
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std::valarray<T> v1(a1, N);
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std::valarray<T> v3 = log(v1);
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assert(v3.size() == v1.size());
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for (std::size_t i = 0; i < v3.size(); ++i)
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assert(is_about(v3[i], a3[i], 10));
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}
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return 0;
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}
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