---
title: "P4198R0: Runtime-Indexed Tuples"
date: 2026-04-17
audience: Library Evolution Working Group (LEWG)
reply-to:
  - "<itfllow123@gmail.com>"
document: p4198r0
paper-type: proposal
---

# P4198R0: Runtime-Indexed Tuples

**Project:** Programming Language C++

Special thanks to Simon Schröder for professional feedback and technical inquiries. Additional credits to Sebastian Wittmeier, Bjorn Reese, Thiago Macieira, Marcin Jaczewski, Andre Kostur, Weinrich Steve, Jason McKesson, Adrian Johnston, and David Brown.