6946f0ecca
A span has no idea what container (if any) "owns" its iterators, nor under what circumstances they might become invalidated. However, continue to use `__wrap_iter<T*>` instead of raw `T*` outside of debug mode, because we've been shipping `std::span` since Clang 7 and ldionne doesn't want to break ABI. (Namely, the mangling of functions taking `span::iterator` as a parameter.) Permit using raw `T*` there, but only under an ABI macro: `_LIBCPP_ABI_SPAN_POINTER_ITERATORS`. Differential Revision: https://reviews.llvm.org/D101003
89 lines
2.4 KiB
C++
89 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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// template<class T, size_t N>
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// span(T (&)[N]) -> span<T, N>;
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//
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// template<class T, size_t N>
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// span(array<T, N>&) -> span<T, N>;
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//
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// template<class T, size_t N>
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// span(const array<T, N>&) -> span<const T, N>;
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//
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// template<class Container>
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// span(Container&) -> span<typename Container::value_type>;
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//
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// template<class Container>
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// span(const Container&) -> span<const typename Container::value_type>;
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#include <span>
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#include <algorithm>
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#include <array>
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#include <cassert>
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#include <string>
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#include <type_traits>
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#include "test_macros.h"
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// std::array is explicitly allowed to be initialized with A a = { init-list };.
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// Disable the missing braces warning for this reason.
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#include "disable_missing_braces_warning.h"
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int main(int, char**)
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{
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{
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int arr[] = {1,2,3};
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std::span s{arr};
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using S = decltype(s);
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ASSERT_SAME_TYPE(S, std::span<int, 3>);
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assert((std::equal(std::begin(arr), std::end(arr), s.begin(), s.end())));
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}
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{
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std::array<double, 4> arr = {1.0, 2.0, 3.0, 4.0};
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std::span s{arr};
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using S = decltype(s);
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ASSERT_SAME_TYPE(S, std::span<double, 4>);
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assert((std::equal(std::begin(arr), std::end(arr), s.begin(), s.end())));
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}
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{
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const std::array<long, 5> arr = {4, 5, 6, 7, 8};
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std::span s{arr};
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using S = decltype(s);
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ASSERT_SAME_TYPE(S, std::span<const long, 5>);
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assert((std::equal(std::begin(arr), std::end(arr), s.begin(), s.end())));
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}
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{
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std::string str{"ABCDE"};
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std::span s{str};
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using S = decltype(s);
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ASSERT_SAME_TYPE(S, std::span<char>);
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assert((size_t)s.size() == str.size());
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assert((std::equal(s.begin(), s.end(), std::begin(s), std::end(s))));
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}
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{
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const std::string str{"QWERTYUIOP"};
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std::span s{str};
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using S = decltype(s);
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ASSERT_SAME_TYPE(S, std::span<const char>);
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assert((size_t)s.size() == str.size());
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assert((std::equal(s.begin(), s.end(), std::begin(s), std::end(s))));
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}
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return 0;
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}
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