# No std::auto_ptr
# Detects usage of deprecated std::auto_ptr
id: no-auto-ptr
name: std::auto_ptr Should Not Be Used
severity: error
category: reliability
defect_class: correctness
inline_tier: blocking
language: cpp

message: "std::auto_ptr should not be used — use std::unique_ptr instead"

description: |
  std::auto_ptr is deprecated (since C++11) and removed in C++17.
  It has dangerous copy semantics. Use std::unique_ptr instead.

  ✅ FIX: Replace with std::unique_ptr

  ```cpp
  std::unique_ptr<MyClass> ptr = std::make_unique<MyClass>();  // GOOD
  ```

query: |
  (template_type
    name: (type_identifier) @NAME (#eq? @NAME "auto_ptr")
    arguments: (template_argument_list) @ARGS)
  ((type_identifier) @NAME
    (#eq? @NAME "auto_ptr"))

metavars:
  - NAME
  - ARGS

tags:
  - reliability
  - cpp
  - deprecated
  - since-cpp11
  - removed-cpp17

examples:
  bad: |
    std::auto_ptr<MyClass> ptr(new MyClass());  // BAD - deprecated

  good: |
    std::unique_ptr<MyClass> ptr = std::make_unique<MyClass>();  // GOOD

has_fix: true
fix_action: replace_auto_with_unique_ptr