From 808fa0f7bd1837fa7ca812c6813574234afd1ad2 Mon Sep 17 00:00:00 2001
From: portersky <porter@nordickey.se>
Date: Mon, 5 Oct 2026 11:58:42 +0200
Subject: [PATCH] docs: add C++ scratchpad notes

Collect new C++ features to cover, design patterns, and compiler
options for catching undefined behavior.

Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@lmstudio.local>
---
 notes/scratch.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 notes/scratch.md

diff --git a/notes/scratch.md b/notes/scratch.md
new file mode 100644
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@@ -0,0 +1,19 @@
+# C++ Scratchpad
+
+## New features in C++
+
+- 23 and 26
+- r-value (and the values that I forgor)
+
+## Patterns
+
+- CRTP
+
+## compiler options that make undefined an error
+
+- -fsanitize=undefined
+- chk_add(), chkd_sub(), chkd_mul()
+- non-portable ways to check CPU overflow
+  - msvc intsafe.h
+
+## Design Patterns