e3d0ac1886
`[[nodiscard]]` should be applied to functions where discarding the return value is most likely a correctness issue. - https://libcxx.llvm.org/CodingGuidelines.html#apply-nodiscard-where-relevant
56 lines
2.8 KiB
C++
56 lines
2.8 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
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// Ensure that APIs which take a CharT* are diagnosing passing a nullptr to them
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// AppleClang doesn't have diagnose_if with diagnostic flags
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// UNSUPPORTED: apple-clang-17
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// ADDITIONAL_COMPILE_FLAGS: -Wno-unused-result
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#include <string_view>
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#include "test_macros.h"
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void func() {
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const char* const np = nullptr;
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std::string_view str1(np); // expected-warning {{null passed}}
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str1 = np; // expected-warning {{null passed}}
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str1.find(np); // expected-warning {{null passed}}
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str1.rfind(np); // expected-warning {{null passed}}
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str1.find_first_of(np); // expected-warning {{null passed}}
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str1.find_last_of(np); // expected-warning {{null passed}}
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str1.find_first_not_of(np); // expected-warning {{null passed}}
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str1.find_last_not_of(np); // expected-warning {{null passed}}
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str1.compare(np); // expected-warning {{null passed}}
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str1.compare(0, 0, np); // expected-warning {{null passed}}
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(void)(str1 == np); // expected-warning {{null passed}}
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#if TEST_STD_VER >= 20
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str1.starts_with(np); // expected-warning {{null passed}}
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str1.ends_with(np); // expected-warning {{null passed}}
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#endif
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#if TEST_STD_VER >= 23
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str1.contains(np); // expected-warning {{null passed}}
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#endif
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// clang-format off
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// These diagnostics are issued via diagnose_if, so we want to check the full description
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std::string_view str2(nullptr, 1); // expected-warning {{null passed to callee that requires a non-null argument if len is not zero}}
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str2.find(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.rfind(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.find_first_of(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.find_last_of(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.find_first_not_of(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.find_last_not_of(nullptr, 0, 1); // expected-warning {{null passed to callee that requires a non-null argument if n is not zero}}
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str2.compare(0, 0, nullptr, 1); // expected-warning {{null passed to callee that requires a non-null argument if n2 is not zero}}
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// clang-format on
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}
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