ee44dd8062
This patch implements the underlying mechanism for range adaptors. It does so based on http://wg21.link/p2387, even though that paper hasn't been adopted yet. In the future, if p2387 is adopted, it would suffice to rename `__bind_back` to `std::bind_back` and `__range_adaptor_closure` to `std::range_adaptor_closure` to implement that paper by the spec. Differential Revision: https://reviews.llvm.org/D107098
27 lines
1.2 KiB
C++
27 lines
1.2 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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// REQUIRES: libc++
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// Test the libc++ extension that std::views::all is marked as [[nodiscard]].
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#include <ranges>
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void test() {
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int range[] = {1, 2, 3};
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auto f = [](int i) { return i; };
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std::views::all(range); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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range | std::views::all; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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std::views::transform(f) | std::views::all; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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std::views::all | std::views::transform(f); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
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}
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