-Wdangling-field detects view members initalized from a by-value owner parameter

描述

struct Foo {};
struct Bar {
  const Foo& foo;
  Bar(Foo f ) : foo(f) {} // good, clang warn on this case
};


struct C {
    string_view s;
    C(std::string c) : s(c) {} // bad, clang doesn't warn on this case. support it
};

贡献者指南

技术栈

cpp

领域

toolingdeveloper experience

议题类型

feature

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

4

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3-5 days

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fresh

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clear

前置要求

C++LLVM/clang development environment setup

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

25

研究方向

Investigate how clang's Wdangling field warning currently detects member initialization from temporary owners. The relevant code is likely in clang/lib/Sema/SemaChecking.cpp or similar diagnostic implementation. Extending the warning to cover std::string view and similar view types when initialized from a by value parameter requires adding logic to recognize view types (e.g., std::string view, std::span) that hold references to temporary strings. Look at existing patterns for detecting dangling references and consider adding a new check for view member init from by value std::string parameters. Review comments on the issue for any suggested approach.