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[libc++][tuple] Applied [[nodiscard]]
#172008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // 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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| // REQUIRES: std-at-least-c++11 | ||
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| // Check that functions are marked [[nodiscard]] | ||
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| #include <tuple> | ||
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| #include "test_macros.h" | ||
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| void test() { | ||
| struct First {}; | ||
| struct Second {}; | ||
| struct Third {}; | ||
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| std::tuple<First, Second, Third> t; | ||
| const std::tuple<First, Second, Third> ct; | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<0>(t); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<0>(ct); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<0>(std::move(t)); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<0>(std::move(t)); | ||
| #if TEST_STD_VER >= 14 | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<Third>(t); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<Third>(ct); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<Third>(std::move(t)); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::get<Third>(std::move(t)); | ||
| #endif | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::tie(ct); | ||
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| First e1; | ||
| Second e2; | ||
| Third e3; | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::make_tuple(e1, e2, e3); | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::forward_as_tuple(First{}, Second{}, Third{}); | ||
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| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::tuple_cat(); | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::tuple_cat(std::tuple<First>{}, std::tuple<Second, Third>{}); | ||
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| #if TEST_STD_VER >= 17 | ||
| // expected-warning@+1 {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
| std::make_from_tuple<First>(std::tuple<First>{}); | ||
| #endif | ||
| } | ||
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