83 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// template<class R>12// concept common_range;13 14#include <ranges>15 16#include "test_iterators.h"17 18template<class It> struct Common { It begin() const; It end() const; };19template<class It> struct NonCommon { It begin() const; sentinel_wrapper<It> end() const; };20template<class It, class Sent> struct Range { It begin() const; Sent end() const; };21 22static_assert(!std::ranges::common_range<Common<cpp17_input_iterator<int*>>>); // not a sentinel for itself23static_assert(!std::ranges::common_range<Common<cpp20_input_iterator<int*>>>); // not a sentinel for itself24static_assert( std::ranges::common_range<Common<forward_iterator<int*>>>);25static_assert( std::ranges::common_range<Common<bidirectional_iterator<int*>>>);26static_assert( std::ranges::common_range<Common<random_access_iterator<int*>>>);27static_assert( std::ranges::common_range<Common<contiguous_iterator<int*>>>);28static_assert( std::ranges::common_range<Common<int*>>);29 30static_assert(!std::ranges::common_range<NonCommon<cpp17_input_iterator<int*>>>);31static_assert(!std::ranges::common_range<NonCommon<cpp20_input_iterator<int*>>>);32static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>>>);33static_assert(!std::ranges::common_range<NonCommon<bidirectional_iterator<int*>>>);34static_assert(!std::ranges::common_range<NonCommon<random_access_iterator<int*>>>);35static_assert(!std::ranges::common_range<NonCommon<contiguous_iterator<int*>>>);36static_assert(!std::ranges::common_range<NonCommon<int*>>);37 38// Test when begin() and end() only differ by their constness.39static_assert(!std::ranges::common_range<Range<int*, int const*>>);40 41// Simple test with a sized_sentinel.42static_assert(!std::ranges::common_range<Range<int*, sized_sentinel<int*>>>);43 44// Make sure cv-qualification doesn't impact the concept when begin() and end() have matching qualifiers.45static_assert( std::ranges::common_range<Common<forward_iterator<int*>> const>);46static_assert(!std::ranges::common_range<NonCommon<forward_iterator<int*>> const>);47 48// Test with a range that's a common_range only when const-qualified.49struct Range1 {50 int* begin();51 int const* begin() const;52 int const* end() const;53};54static_assert(!std::ranges::common_range<Range1>);55static_assert( std::ranges::common_range<Range1 const>);56 57// Test with a range that's a common_range only when not const-qualified.58struct Range2 {59 int* begin() const;60 int* end();61 int const* end() const;62};63static_assert( std::ranges::common_range<Range2>);64static_assert(!std::ranges::common_range<Range2 const>);65 66// Test ADL-proofing.67struct Incomplete;68template<class T> struct Holder { T t; };69 70static_assert(!std::ranges::common_range<Holder<Incomplete>*>);71static_assert(!std::ranges::common_range<Holder<Incomplete>*&>);72static_assert(!std::ranges::common_range<Holder<Incomplete>*&&>);73static_assert(!std::ranges::common_range<Holder<Incomplete>* const>);74static_assert(!std::ranges::common_range<Holder<Incomplete>* const&>);75static_assert(!std::ranges::common_range<Holder<Incomplete>* const&&>);76 77static_assert( std::ranges::common_range<Holder<Incomplete>*[10]>);78static_assert( std::ranges::common_range<Holder<Incomplete>*(&)[10]>);79static_assert( std::ranges::common_range<Holder<Incomplete>*(&&)[10]>);80static_assert( std::ranges::common_range<Holder<Incomplete>* const[10]>);81static_assert( std::ranges::common_range<Holder<Incomplete>* const(&)[10]>);82static_assert( std::ranges::common_range<Holder<Incomplete>* const(&&)[10]>);83