119 lines
3.9 KiB
C++
119 lines
3.9 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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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <span>
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// constexpr reverse_iterator rbegin() const noexcept;
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// constexpr const_reverse_iterator crbegin() const noexcept;
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#include <span>
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#include <cassert>
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#include <string>
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#include "test_macros.h"
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template <class Span>
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constexpr bool testConstexprSpan(Span s)
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{
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bool ret = true;
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typename Span::reverse_iterator b = s. rbegin();
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typename Span::const_reverse_iterator cb = s.crbegin();
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if (s.empty())
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{
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ret = ret && ( b == s.rend());
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ret = ret && (cb == s.crend());
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}
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else
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{
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const typename Span::index_type last = s.size() - 1;
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ret = ret && ( *b == s[last]);
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ret = ret && ( &*b == &s[last]);
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ret = ret && ( *cb == s[last]);
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ret = ret && (&*cb == &s[last]);
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}
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ret = ret && (b == cb);
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return ret;
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}
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template <class Span>
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void testRuntimeSpan(Span s)
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{
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typename Span::reverse_iterator b = s. rbegin();
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typename Span::const_reverse_iterator cb = s.crbegin();
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if (s.empty())
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{
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assert( b == s.rend());
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assert(cb == s.crend());
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}
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else
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{
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const typename Span::index_type last = s.size() - 1;
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assert( *b == s[last]);
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assert( &*b == &s[last]);
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assert( *cb == s[last]);
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assert(&*cb == &s[last]);
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}
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assert(b == cb);
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}
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struct A{};
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bool operator==(A, A) {return true;}
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constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
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int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
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int main(int, char**)
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{
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static_assert(testConstexprSpan(std::span<int>()), "");
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static_assert(testConstexprSpan(std::span<long>()), "");
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static_assert(testConstexprSpan(std::span<double>()), "");
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static_assert(testConstexprSpan(std::span<A>()), "");
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static_assert(testConstexprSpan(std::span<std::string>()), "");
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static_assert(testConstexprSpan(std::span<int, 0>()), "");
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static_assert(testConstexprSpan(std::span<long, 0>()), "");
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static_assert(testConstexprSpan(std::span<double, 0>()), "");
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static_assert(testConstexprSpan(std::span<A, 0>()), "");
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static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
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static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
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testRuntimeSpan(std::span<int> ());
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testRuntimeSpan(std::span<long> ());
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testRuntimeSpan(std::span<double> ());
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testRuntimeSpan(std::span<A> ());
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testRuntimeSpan(std::span<std::string>());
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testRuntimeSpan(std::span<int, 0> ());
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testRuntimeSpan(std::span<long, 0> ());
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testRuntimeSpan(std::span<double, 0> ());
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testRuntimeSpan(std::span<A, 0> ());
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testRuntimeSpan(std::span<std::string, 0>());
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testRuntimeSpan(std::span<int>(iArr2, 1));
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testRuntimeSpan(std::span<int>(iArr2, 2));
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testRuntimeSpan(std::span<int>(iArr2, 3));
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testRuntimeSpan(std::span<int>(iArr2, 4));
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testRuntimeSpan(std::span<int>(iArr2, 5));
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std::string s;
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testRuntimeSpan(std::span<std::string>(&s, static_cast<std::ptrdiff_t>(0)));
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testRuntimeSpan(std::span<std::string>(&s, 1));
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return 0;
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}
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