31cbe0f240
C++98 and C++03 are effectively aliases as far as Clang is concerned. As such, allowing both std=c++98 and std=c++03 as Lit parameters is just slightly confusing, but provides no value. It's similar to allowing both std=c++17 and std=c++1z, which we don't do. This was discovered because we had an internal bot that ran the test suite under both c++98 AND c++03 -- one of which is redundant. Differential Revision: https://reviews.llvm.org/D80926
85 lines
2.4 KiB
C++
85 lines
2.4 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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// constexpr reference front() const noexcept;
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// Expects: empty() is false.
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// Effects: Equivalent to: return *data();
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//
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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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constexpr bool testConstexprSpan(Span sp)
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{
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LIBCPP_ASSERT(noexcept(sp.front()));
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return std::addressof(sp.front()) == sp.data();
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}
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template <typename Span>
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void testRuntimeSpan(Span sp)
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{
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LIBCPP_ASSERT(noexcept(sp.front()));
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assert(std::addressof(sp.front()) == sp.data());
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}
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template <typename Span>
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void testEmptySpan(Span sp)
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{
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if (!sp.empty())
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[[maybe_unused]] auto res = sp.front();
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}
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struct A{};
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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<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, 1>(iArr1, 1)), "");
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static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2)), "");
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static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3)), "");
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static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4)), "");
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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, 1>(iArr2, 1));
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testRuntimeSpan(std::span<int, 2>(iArr2, 2));
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testRuntimeSpan(std::span<int, 3>(iArr2, 3));
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testRuntimeSpan(std::span<int, 4>(iArr2, 4));
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std::string s;
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testRuntimeSpan(std::span<std::string> (&s, 1));
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testRuntimeSpan(std::span<std::string, 1>(&s, 1));
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std::span<int, 0> sp;
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testEmptySpan(sp);
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return 0;
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}
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