Unions - Unsafe Code Guidelines Reference (original) (raw)

1. 1. Introduction
2. 2. Glossary
3. 3. Data layout
4. 1. 3.1. Structs and tuples
   2. 3.2. Scalars
   3. 3.3. Enums
   4. 3.4. Unions
   5. 3.5. Pointers
   6. 3.6. Function pointers
   7. 3.7. Arrays and Slices
   8. 3.8. Packed SIMD vectors
5. 4. Validity
6. 1. 4.1. Unions
   2. 4.2. Function Pointers
7. 5. Optimizations
8. 1. 5.1. Return value optimization

Unsafe Code Guidelines Reference

Layout of unions

This page has been archived

It did not actually reflect current layout guarantees and caused frequent confusion.

The old content can be accessed on GitHub.