5a3309f825
* `std::ranges::begin`
* `std::ranges::cbegin`
* `std::ranges::end`
* `std::ranges::cend`
* `std::ranges::iterator` (required for `end`)
Implements parts of:
* P0896R4 The One Ranges Proposal`
Co-author: @zoecarver
Depends on D90999, D100160.
Differential Revision: https://reviews.llvm.org/D100255
44 lines
1.5 KiB
C++
44 lines
1.5 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: gcc-10
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// XFAIL: msvc && clang
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// unspecified begin;
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#include <ranges>
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#include <type_traits>
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using end_t = decltype(std::ranges::end);
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// clang-format off
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template <class T>
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requires(!std::invocable<end_t&, T>)
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void f() {}
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// clang-format on
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void test() {
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struct incomplete;
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f<incomplete(&)[]>();
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// expected-error@*:* {{"`std::ranges::begin` is SFINAE-unfriendly on arrays of an incomplete type."}}
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// expected-error@*:* {{"`std::ranges::end` is SFINAE-unfriendly on arrays of an incomplete type."}}
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f<incomplete(&)[10]>();
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// expected-error@*:* {{"`std::ranges::begin` is SFINAE-unfriendly on arrays of an incomplete type."}}
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// expected-error@*:* {{"`std::ranges::end` is SFINAE-unfriendly on arrays of an incomplete type."}}
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// expected-error@-3 {{no matching function for call to 'f'}}
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f<incomplete(&)[2][2]>();
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// expected-error@*:* {{"`std::ranges::begin` is SFINAE-unfriendly on arrays of an incomplete type."}}
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// expected-error@-2 {{no matching function for call to 'f'}}
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// This is okay because calling `std::ranges::end` on any rvalue is ill-formed.
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f<incomplete(&&)[10]>();
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}
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