1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <valarray>
10
11// template<class T> class valarray;
12
13// valarray operator+() const;
14
15#include <valarray>
16#include <cassert>
17#include <cstddef>
18
19#include "test_macros.h"
20
21int main(int, char**)
22{
23 {
24 typedef int T;
25 T a[] = {1, 2, 3, 4, 5};
26 const unsigned N = sizeof(a)/sizeof(a[0]);
27 std::valarray<T> v(a, N);
28 std::valarray<T> v2 = +v;
29 assert(v2.size() == v.size());
30 for (std::size_t i = 0; i < v2.size(); ++i)
31 assert(v2[i] == +v[i]);
32 }
33 {
34 typedef double T;
35 T a[] = {1, 2.5, 3, 4.25, 5};
36 const unsigned N = sizeof(a)/sizeof(a[0]);
37 std::valarray<T> v(a, N);
38 std::valarray<T> v2 = +v;
39 assert(v2.size() == v.size());
40 for (std::size_t i = 0; i < v2.size(); ++i)
41 assert(v2[i] == +v[i]);
42 }
43 {
44 typedef std::valarray<double> T;
45 T a[] = {T(1), T(2), T(3), T(4), T(5)};
46 const unsigned N = sizeof(a)/sizeof(a[0]);
47 std::valarray<T> v(a, N);
48 std::valarray<T> v2 = +v;
49 assert(v2.size() == v.size());
50 for (unsigned i = 0; i < N; ++i)
51 {
52 assert(v2[i].size() == v[i].size());
53 for (std::size_t j = 0; j < v[i].size(); ++j)
54 assert(v2[i][j] == +v[i][j]);
55 }
56 }
57 {
58 typedef double T;
59 T a[] = {1, 2.5, 3, 4.25, 5};
60 const unsigned N = sizeof(a)/sizeof(a[0]);
61 std::valarray<T> v(a, N);
62 std::valarray<T> v2 = +(v + v);
63 assert(v2.size() == v.size());
64 for (std::size_t i = 0; i < v2.size(); ++i)
65 assert(v2[i] == +2*v[i]);
66 }
67 {
68 // Make sure we don't have dangling reference problems with unary expressions
69 int array[] = {1, 2, 3};
70 std::valarray<int> a(array, 3);
71 std::valarray<int> b(array, 3);
72 auto c = +a * b;
73 assert(c.size() == 3);
74 assert(c[0] == 1 && c[1] == 4 && c[2] == 9);
75 }
76
77 return 0;
78}
79

source code of libcxx/test/std/numerics/numarray/template.valarray/valarray.unary/plus.pass.cpp