138 lines
4.0 KiB
C++
138 lines
4.0 KiB
C++
// -*- C++ -*-
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//===------------------------------ span ---------------------------------===//
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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++03, c++11, c++14, c++17
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// <span>
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// template<size_t Count>
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// constexpr span<element_type, Count> last() const;
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//
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// constexpr span<element_type, dynamic_extent> last(size_type count) const;
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//
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// Requires: Count <= size().
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#include <span>
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#include <cassert>
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#include <algorithm>
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#include <string>
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#include "test_macros.h"
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template <typename Span, size_t Count>
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constexpr bool testConstexprSpan(Span sp)
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{
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LIBCPP_ASSERT((noexcept(sp.template last<Count>())));
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LIBCPP_ASSERT((noexcept(sp.last(Count))));
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auto s1 = sp.template last<Count>();
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auto s2 = sp.last(Count);
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using S1 = decltype(s1);
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using S2 = decltype(s2);
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ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
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ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
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static_assert(S1::extent == Count, "");
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static_assert(S2::extent == std::dynamic_extent, "");
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return
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s1.data() == s2.data()
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&& s1.size() == s2.size()
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&& std::equal(s1.begin(), s1.end(), sp.end() - Count);
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}
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template <typename Span, size_t Count>
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void testRuntimeSpan(Span sp)
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{
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LIBCPP_ASSERT((noexcept(sp.template last<Count>())));
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LIBCPP_ASSERT((noexcept(sp.last(Count))));
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auto s1 = sp.template last<Count>();
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auto s2 = sp.last(Count);
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using S1 = decltype(s1);
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using S2 = decltype(s2);
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ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
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ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
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static_assert(S1::extent == Count, "");
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static_assert(S2::extent == std::dynamic_extent, "");
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assert(s1.data() == s2.data());
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assert(s1.size() == s2.size());
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assert(std::equal(s1.begin(), s1.end(), sp.end() - Count));
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}
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constexpr int carr1[] = {1,2,3,4};
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int arr[] = {5,6,7};
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std::string sarr [] = { "ABC", "DEF", "GHI", "JKL", "MNO"};
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int main(int, char**)
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{
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{
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using Sp = std::span<const int>;
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static_assert(testConstexprSpan<Sp, 0>(Sp{}), "");
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static_assert(testConstexprSpan<Sp, 0>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 1>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 2>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 3>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 4>(Sp{carr1}), "");
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}
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{
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using Sp = std::span<const int, 4>;
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static_assert(testConstexprSpan<Sp, 0>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 1>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 2>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 3>(Sp{carr1}), "");
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static_assert(testConstexprSpan<Sp, 4>(Sp{carr1}), "");
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}
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{
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using Sp = std::span<int>;
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testRuntimeSpan<Sp, 0>(Sp{});
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testRuntimeSpan<Sp, 0>(Sp{arr});
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testRuntimeSpan<Sp, 1>(Sp{arr});
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testRuntimeSpan<Sp, 2>(Sp{arr});
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testRuntimeSpan<Sp, 3>(Sp{arr});
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}
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{
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using Sp = std::span<int, 3>;
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testRuntimeSpan<Sp, 0>(Sp{arr});
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testRuntimeSpan<Sp, 1>(Sp{arr});
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testRuntimeSpan<Sp, 2>(Sp{arr});
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testRuntimeSpan<Sp, 3>(Sp{arr});
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}
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{
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using Sp = std::span<std::string>;
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testConstexprSpan<Sp, 0>(Sp{});
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testRuntimeSpan<Sp, 0>(Sp{sarr});
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testRuntimeSpan<Sp, 1>(Sp{sarr});
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testRuntimeSpan<Sp, 2>(Sp{sarr});
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testRuntimeSpan<Sp, 3>(Sp{sarr});
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testRuntimeSpan<Sp, 4>(Sp{sarr});
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testRuntimeSpan<Sp, 5>(Sp{sarr});
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}
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{
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using Sp = std::span<std::string, 5>;
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testRuntimeSpan<Sp, 0>(Sp{sarr});
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testRuntimeSpan<Sp, 1>(Sp{sarr});
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testRuntimeSpan<Sp, 2>(Sp{sarr});
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testRuntimeSpan<Sp, 3>(Sp{sarr});
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testRuntimeSpan<Sp, 4>(Sp{sarr});
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testRuntimeSpan<Sp, 5>(Sp{sarr});
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}
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return 0;
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}
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