633d1d0df7
Previously, we'd use raw pointers when the debug mode was enabled, which means we wouldn't get out-of-range checking with std::span's iterators. This patch introduces a new class called __bounded_iter which can be used to wrap iterators and make them carry around bounds-related information. This allows iterators to assert when they are dereferenced outside of their bounds. As a fly-by change, this commit removes the _LIBCPP_ABI_SPAN_POINTER_ITERATORS knob. Indeed, not using a raw pointer as the iterator type is useful to avoid users depending on properties of raw pointers in their code. This is an alternative to D127401. Differential Revision: https://reviews.llvm.org/D127418
30 lines
961 B
C++
30 lines
961 B
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++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> first() const;
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//
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// Requires: Count <= size().
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#include <span>
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#include <cstddef>
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void f() {
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int array[] = {1, 2, 3, 4};
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std::span<const int, 4> sp(array);
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// Count too large
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[[maybe_unused]] auto s1 = sp.first<5>(); // expected-error@span:* {{span<T, N>::first<Count>(): Count out of range}}
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// Count numeric_limits
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[[maybe_unused]] auto s2 = sp.first<std::size_t(-1)>(); // expected-error@span:* {{span<T, N>::first<Count>(): Count out of range}}
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}
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