# Explainer: Type Punning in C and C++

Type punning is the technique of reinterpreting a value of one data type as another by reading the same memory differently, commonly done in C and C++ via unions, memcpy, or pointer casts. The article explains why the practice often runs afoul of strict aliasing rules and undefined behavior, making it a frequent source of subtle compiler-dependent bugs.

**Importance:** 1/5

## Sources

### Technology
- [Hacker News](https://blog.pwkf.org/2026/09/21/correct-type-punning-in-c.html) — Tue, 22 Sep 2026 11:29:47 +0000