forked from OSchip/llvm-project
80 lines
2.5 KiB
C++
80 lines
2.5 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++98, c++03, c++11, c++14, c++17
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// <span>
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// template <class ElementType, size_t Extent>
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// span<byte,
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// Extent == dynamic_extent
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// ? dynamic_extent
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// : sizeof(ElementType) * Extent>
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// as_writable_bytes(span<ElementType, Extent> s) 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<typename Span>
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void testRuntimeSpan(Span sp)
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{
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ASSERT_NOEXCEPT(std::as_writable_bytes(sp));
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auto spBytes = std::as_writable_bytes(sp);
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using SB = decltype(spBytes);
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ASSERT_SAME_TYPE(std::byte, typename SB::element_type);
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if constexpr (sp.extent == std::dynamic_extent)
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assert(spBytes.extent == std::dynamic_extent);
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else
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assert(spBytes.extent == sizeof(typename Span::element_type) * sp.extent);
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assert(static_cast<void*>(spBytes.data()) == static_cast<void*>(sp.data()));
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assert(spBytes.size() == sp.size_bytes());
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}
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struct A{};
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int iArr2[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
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int main(int, char**)
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{
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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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testRuntimeSpan(std::span<int, 1>(iArr2 + 5, 1));
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testRuntimeSpan(std::span<int, 2>(iArr2 + 4, 2));
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testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3));
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testRuntimeSpan(std::span<int, 4>(iArr2 + 2, 4));
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testRuntimeSpan(std::span<int, 5>(iArr2 + 1, 5));
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std::string s;
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testRuntimeSpan(std::span<std::string>(&s, (std::size_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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