1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
// -*- C++ -*-
//===------------------------------ span ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===---------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <span>
// constexpr span(pointer ptr, index_type count);
// Requires: [ptr, ptr + count) shall be a valid range.
// If extent is not equal to dynamic_extent, then count shall be equal to extent.
//
#include <span>
#include <cassert>
#include <string>
#include "test_macros.h"
void checkCV()
{
int arr[] = {1,2,3};
const int carr[] = {4,5,6};
volatile int varr[] = {7,8,9};
const volatile int cvarr[] = {1,3,5};
// Types the same (dynamic sized)
{
std::span< int> s1{ arr, 3}; // a span< int> pointing at int.
std::span<const int> s2{ carr, 3}; // a span<const int> pointing at const int.
std::span< volatile int> s3{ varr, 3}; // a span< volatile int> pointing at volatile int.
std::span<const volatile int> s4{cvarr, 3}; // a span<const volatile int> pointing at const volatile int.
assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
}
// Types the same (static sized)
{
std::span< int,3> s1{ arr, 3}; // a span< int> pointing at int.
std::span<const int,3> s2{ carr, 3}; // a span<const int> pointing at const int.
std::span< volatile int,3> s3{ varr, 3}; // a span< volatile int> pointing at volatile int.
std::span<const volatile int,3> s4{cvarr, 3}; // a span<const volatile int> pointing at const volatile int.
assert(s1.size() + s2.size() + s3.size() + s4.size() == 12);
}
// types different (dynamic sized)
{
std::span<const int> s1{ arr, 3}; // a span<const int> pointing at int.
std::span< volatile int> s2{ arr, 3}; // a span< volatile int> pointing at int.
std::span< volatile int> s3{ arr, 3}; // a span< volatile int> pointing at const int.
std::span<const volatile int> s4{ arr, 3}; // a span<const volatile int> pointing at int.
std::span<const volatile int> s5{carr, 3}; // a span<const volatile int> pointing at const int.
std::span<const volatile int> s6{varr, 3}; // a span<const volatile int> pointing at volatile int.
assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
}
// types different (static sized)
{
std::span<const int,3> s1{ arr, 3}; // a span<const int> pointing at int.
std::span< volatile int,3> s2{ arr, 3}; // a span< volatile int> pointing at int.
std::span< volatile int,3> s3{ arr, 3}; // a span< volatile int> pointing at const int.
std::span<const volatile int,3> s4{ arr, 3}; // a span<const volatile int> pointing at int.
std::span<const volatile int,3> s5{carr, 3}; // a span<const volatile int> pointing at const int.
std::span<const volatile int,3> s6{varr, 3}; // a span<const volatile int> pointing at volatile int.
assert(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size() == 18);
}
}
template <typename T>
constexpr bool testConstexprSpan()
{
constexpr T val[2] = {};
std::span<const T> s1{val, 2};
std::span<const T,2> s2{val, 2};
return
s1.data() == &val[0] && s1.size() == 2
&& s2.data() == &val[0] && s2.size() == 2;
}
template <typename T>
void testRuntimeSpan()
{
T val[2] = {};
std::span<T> s1{val, 2};
std::span<T,2> s2{val, 2};
assert(s1.data() == &val[0] && s1.size() == 2);
assert(s2.data() == &val[0] && s2.size() == 2);
}
struct A{};
int main ()
{
static_assert(testConstexprSpan<int>(), "");
static_assert(testConstexprSpan<long>(), "");
static_assert(testConstexprSpan<double>(), "");
static_assert(testConstexprSpan<A>(), "");
testRuntimeSpan<int>();
testRuntimeSpan<long>();
testRuntimeSpan<double>();
testRuntimeSpan<std::string>();
testRuntimeSpan<A>();
checkCV();
}
|
