clang-tidy - bugprone-dangling-handle — Extra Clang Tools 21.1.8 documentation

# Extra Clang Tools 21.1.8 documentation

## clang-tidy - bugprone-dangling-handle

# bugprone-dangling-handle

Detect dangling references in value handles like `std::string_view`. These dangling references can be a result of constructing handles from temporary values, where the temporary is destroyed soon after the handle is created.

Examples:

    string_view View = string();  // View will dangle.
    string A;
    View = A + "A";  // still dangle.

    vector<string_view> V;
    V.push_back(string());  // V[0] is dangling.
    V.resize(3, string());  // V[1] and V[2] will also dangle.

    string_view f() {
      // All these return values will dangle.
      return string();
      string S;
      return S;
      char Array[10]{};
      return Array;
    }

    span<int> g() {
      array<int, 1> V;
      return {V};
      int Array[10]{};
      return {Array};
    }

## Options

HandleClasses

  A semicolon-separated list of class names that should be treated as handles. By default only `std::basic_string_view`, `std::experimental::basic_string_view` and `std::span` are considered.