m15-anti-pattern

常见的 C++ 反模式。触发点：全局变量、new/delete、C 风格的强制类型转换、宏、void*。

SKILL.md

--- frontmatter

name: m15-anti-pattern
description: "Common C++ Anti-Patterns. Triggers: global variables, new/delete, C-style cast, macros, void*."

C++ Anti-Patterns

Core Question

Is this C or C++?

•C-Style: malloc, free, (int)x, void*.
•C++ Style: std::vector, std::unique_ptr, static_cast, templates.

Error → Design Question

Issue	Design Question
Hard to refactor	Are you using Macros?
Leak	Are you using `new`?
UB	Are you using `reinterpret_cast`?

Thinking Prompt

•
Can I delete this new?
- •Use make_unique.
•
Can I remove this macro?
- •Use constexpr or templates.

Quick Reference

Anti-Pattern	Modern Fix
`new T`	`make_unique<T>`
*`T` ownership**	`unique_ptr<T>`
`(T)ptr`	`static_cast<T>(ptr)`
`#define`	`constexpr`