f4c1258d56
Some embedded platforms do not wish to support the C library functionality for handling wchar_t because they have no use for it. It makes sense for libc++ to work properly on those platforms, so this commit adds a carve-out of functionality for wchar_t. Unfortunately, unlike some other carve-outs (e.g. random device), this patch touches several parts of the library. However, despite the wide impact of this patch, I still think it is important to support this configuration since it makes it much simpler to port libc++ to some embedded platforms. Differential Revision: https://reviews.llvm.org/D111265
52 lines
2.0 KiB
C++
52 lines
2.0 KiB
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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// UNSUPPORTED: libcpp-no-concepts
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// class std::ranges::subrange;
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#include <ranges>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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using FI = forward_iterator<int*>;
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FI fi{nullptr};
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int *ptr = nullptr;
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static_assert(std::same_as<decltype(std::ranges::subrange(fi, fi)),
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std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);
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static_assert(std::same_as<decltype(std::ranges::subrange(ptr, ptr, 0)),
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std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
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static_assert(std::same_as<decltype(std::ranges::subrange(ptr, nullptr, 0)),
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std::ranges::subrange<int*, std::nullptr_t, std::ranges::subrange_kind::sized>>);
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struct ForwardRange {
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forward_iterator<int*> begin() const;
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forward_iterator<int*> end() const;
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<ForwardRange> = true;
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struct SizedRange {
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int *begin();
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int *end();
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<SizedRange> = true;
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static_assert(std::same_as<decltype(std::ranges::subrange(ForwardRange())),
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std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);
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static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange())),
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std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
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static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange(), 8)),
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std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
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