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[libc++] Applied [[nodiscard]] to Language Support (partially)
#169611
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H-G-Hristov:hgh/libcxx/nodiscard-to-language-support
Nov 26, 2025
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| Original file line number | Diff line number | Diff line change |
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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 | ||
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| // check that <utility> functions are marked [[nodiscard]] | ||
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| #include <compare> | ||
| #include <coroutine> | ||
| #include <functional> | ||
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| #include <initializer_list> | ||
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| #include "test_macros.h" | ||
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| void test() { | ||
| #if TEST_STD_VER >= 20 | ||
| { // <compare> | ||
| int x = 94; | ||
| int y = 82; | ||
| auto oRes = x <=> y; | ||
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| std::is_eq(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::is_neq(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::is_lt(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::is_lteq(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::is_gt(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::is_gteq(oRes); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| } | ||
| #endif | ||
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| #if TEST_STD_VER >= 20 | ||
| { // <coroutine> | ||
| struct EmptyPromise { | ||
| } promise; | ||
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| { | ||
| std::coroutine_handle<void> cr{}; | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.address(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::coroutine_handle<void>::from_address(&promise); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.done(); | ||
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| std::hash<std::coroutine_handle<void>> hash; | ||
| hash(cr); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| } | ||
| { | ||
| std::coroutine_handle<EmptyPromise> cr; | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::coroutine_handle<EmptyPromise>::from_promise(promise); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.address(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::coroutine_handle<EmptyPromise>::from_address(&promise); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.done(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.promise(); | ||
| } | ||
| { | ||
| std::coroutine_handle<std::noop_coroutine_promise> cr = std::noop_coroutine(); | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.done(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.promise(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| cr.address(); | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::noop_coroutine(); | ||
| } | ||
| } | ||
| #endif | ||
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| { // <initializer_list> | ||
| std::initializer_list<int> il{94, 82, 49}; | ||
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| il.size(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| il.begin(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| il.end(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| } | ||
| } | ||
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