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[libc++][ranges][NFC] Test the specializations of `tuple_{size,elemen…
…t}` for ranges. Also update the synopsis in `<ranges>` to mention the specializations. Differential Revision: https://reviews.llvm.org/D118686
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libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.ranges.pass.cpp
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//===----------------------------------------------------------------------===// | ||
// | ||
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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// UNSUPPORTED: c++03, c++11, c++14, c++17 | ||
// UNSUPPORTED: libcpp-no-concepts | ||
// UNSUPPORTED: libcpp-has-no-incomplete-ranges | ||
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// <ranges> | ||
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// template<class T> struct tuple_size; | ||
// template<size_t I, class T> struct tuple_element; | ||
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#include <ranges> | ||
// Note: make sure to not include `<utility>` (or any other header including `<utility>`) because it also makes some | ||
// tuple specializations available, thus obscuring whether the `<ranges>` includes work correctly. | ||
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using Iterator = int*; | ||
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class SizedSentinel { | ||
public: | ||
constexpr bool operator==(int*) const; | ||
friend constexpr ptrdiff_t operator-(const SizedSentinel&, int*); | ||
friend constexpr ptrdiff_t operator-(int*, const SizedSentinel&); | ||
}; | ||
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static_assert(std::sized_sentinel_for<SizedSentinel, Iterator>); | ||
using SizedRange = std::ranges::subrange<Iterator, SizedSentinel>; | ||
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using UnsizedSentinel = std::unreachable_sentinel_t; | ||
static_assert(!std::sized_sentinel_for<UnsizedSentinel, Iterator>); | ||
using UnsizedRange = std::ranges::subrange<Iterator, UnsizedSentinel>; | ||
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// Because the sentinel is unsized while the subrange is sized, an additional integer member will be used to store the | ||
// size -- make sure it doesn't affect the value of `tuple_size`. | ||
using ThreeElementRange = std::ranges::subrange<Iterator, UnsizedSentinel, std::ranges::subrange_kind::sized>; | ||
static_assert(std::ranges::sized_range<ThreeElementRange>); | ||
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static_assert(std::tuple_size<SizedRange>::value == 2); | ||
static_assert(std::tuple_size<UnsizedRange>::value == 2); | ||
static_assert(std::tuple_size<ThreeElementRange>::value == 2); | ||
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template <int I, class Range, class Expected> | ||
constexpr bool test_tuple_element() { | ||
static_assert(std::same_as<typename std::tuple_element<I, Range>::type, Expected>); | ||
static_assert(std::same_as<typename std::tuple_element<I, const Range>::type, Expected>); | ||
// Note: the Standard does not mandate a specialization of `tuple_element` for volatile, so trying a `volatile Range` | ||
// would fail to compile. | ||
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return true; | ||
} | ||
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int main(int, char**) { | ||
static_assert(test_tuple_element<0, SizedRange, Iterator>()); | ||
static_assert(test_tuple_element<1, SizedRange, SizedSentinel>()); | ||
static_assert(test_tuple_element<0, UnsizedRange, Iterator>()); | ||
static_assert(test_tuple_element<1, UnsizedRange, UnsizedSentinel>()); | ||
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return 0; | ||
} |