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// UNSUPPORTED: c++03, c++11, c++14
10
11// <valarray>
12
13// template<class T, size_t cnt> valarray(const T(&)[cnt], size_t) -> valarray<T>;
14
15#include <valarray>
16
17#include "test_macros.h"
18
19int main(int, char**)
20{
21 {
22 // From (initializer_list<T>)
23 std::valarray v = {1, 2, 3, 4, 5};
24 ASSERT_SAME_TYPE(decltype(v), std::valarray<int>);
25 }
26
27 {
28 // From (const T(&)[N], size_t)
29 long a[] = {1, 2, 3, 4, 5};
30 std::valarray v(a, 5);
31 ASSERT_SAME_TYPE(decltype(v), std::valarray<long>);
32 }
33
34 {
35 // From (const T&, size_t)
36 long a[] = {1, 2, 3, 4, 5};
37 std::valarray v(&a[0], 5);
38 // Surprising but true.
39 ASSERT_SAME_TYPE(decltype(v), std::valarray<long*>);
40 }
41
42 {
43 // From (slice_array<T>)
44 std::valarray<long> v{1,2,3,4,5};
45 std::valarray v2 = v[std::slice(2,3,1)];
46 static_assert(std::is_same_v<decltype(v2), std::valarray<long>>);
47 }
48
49 {
50 // From (gslice_array<T>)
51 std::valarray<long> v{1,2,3,4,5};
52 std::valarray v2 = v[std::gslice(0, {5}, {1})];
53 static_assert(std::is_same_v<decltype(v2), std::valarray<long>>);
54 }
55
56 {
57 // From (mask_array<T>)
58 std::valarray<long> v = {1, 2, 3, 4, 5};
59 std::valarray<bool> m = {true, false, true, false, true};
60 std::valarray v2 = v[m];
61 static_assert(std::is_same_v<decltype(v2), std::valarray<long>>);
62 }
63
64 {
65 // From (indirect_array<T>)
66 std::valarray<long> v = {1, 2, 3, 4, 5};
67 std::valarray<std::size_t> i = {1, 2, 3};
68 std::valarray v2 = v[i];
69 static_assert(std::is_same_v<decltype(v2), std::valarray<long>>);
70 }
71
72 return 0;
73}
74

source code of libcxx/test/std/numerics/numarray/template.valarray/valarray.cons/deduct.pass.cpp