1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
13 // constexpr reverse_iterator rbegin() const noexcept;
14 // constexpr const_reverse_iterator crbegin() const noexcept;
20 #include "test_macros.h"
23 constexpr bool testConstexprSpan(Span s)
26 typename Span::reverse_iterator b = s. rbegin();
27 typename Span::const_reverse_iterator cb = s.crbegin();
30 ret = ret && ( b == s.rend());
31 ret = ret && (cb == s.crend());
35 const typename Span::index_type last = s.size() - 1;
36 ret = ret && ( *b == s[last]);
37 ret = ret && ( &*b == &s[last]);
38 ret = ret && ( *cb == s[last]);
39 ret = ret && (&*cb == &s[last]);
41 ret = ret && (b == cb);
47 void testRuntimeSpan(Span s)
49 typename Span::reverse_iterator b = s. rbegin();
50 typename Span::const_reverse_iterator cb = s.crbegin();
53 assert( b == s.rend());
54 assert(cb == s.crend());
58 const typename Span::index_type last = s.size() - 1;
59 assert( *b == s[last]);
60 assert( &*b == &s[last]);
61 assert( *cb == s[last]);
62 assert(&*cb == &s[last]);
69 bool operator==(A, A) {return true;}
71 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
72 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
77 static_assert(testConstexprSpan(std::span<int>()), "");
78 static_assert(testConstexprSpan(std::span<long>()), "");
79 static_assert(testConstexprSpan(std::span<double>()), "");
80 static_assert(testConstexprSpan(std::span<A>()), "");
81 static_assert(testConstexprSpan(std::span<std::string>()), "");
83 static_assert(testConstexprSpan(std::span<int, 0>()), "");
84 static_assert(testConstexprSpan(std::span<long, 0>()), "");
85 static_assert(testConstexprSpan(std::span<double, 0>()), "");
86 static_assert(testConstexprSpan(std::span<A, 0>()), "");
87 static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
89 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
90 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
91 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
92 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
93 static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
96 testRuntimeSpan(std::span<int> ());
97 testRuntimeSpan(std::span<long> ());
98 testRuntimeSpan(std::span<double> ());
99 testRuntimeSpan(std::span<A> ());
100 testRuntimeSpan(std::span<std::string>());
102 testRuntimeSpan(std::span<int, 0> ());
103 testRuntimeSpan(std::span<long, 0> ());
104 testRuntimeSpan(std::span<double, 0> ());
105 testRuntimeSpan(std::span<A, 0> ());
106 testRuntimeSpan(std::span<std::string, 0>());
108 testRuntimeSpan(std::span<int>(iArr2, 1));
109 testRuntimeSpan(std::span<int>(iArr2, 2));
110 testRuntimeSpan(std::span<int>(iArr2, 3));
111 testRuntimeSpan(std::span<int>(iArr2, 4));
112 testRuntimeSpan(std::span<int>(iArr2, 5));
115 testRuntimeSpan(std::span<std::string>(&s, static_cast<std::ptrdiff_t>(0)));
116 testRuntimeSpan(std::span<std::string>(&s, 1));