llvm-project/libcxx/test/std/ranges/range.access/range.access.cbegin/incomplete.compile.verify.cpp

38 lines
1.1 KiB
C++

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// UNSUPPORTED: clang-10
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// ranges::cbegin;
#include <ranges>
#include <type_traits>
using cbegin_t = decltype(std::ranges::cbegin);
// clang-format off
template <class T>
requires(!std::invocable<cbegin_t&, T>)
void f() {}
// clang-format on
void test() {
struct incomplete;
f<incomplete(&)[10]>();
// expected-error@*:* {{"`std::ranges::begin` is SFINAE-unfriendly on arrays of an incomplete type."}}
// expected-error@-2 {{no matching function for call to 'f'}}
// This is okay because calling `std::ranges::end` on any rvalue is ill-formed.
f<incomplete(&&)[10]>();
}