cpp

# Modern C++ Write, review, modernize, build, and debug C++ the way the C++ Core Guidelines intend: RAII for every resource, ownership made explicit through smart pointers and values, no undefined behavior by construction, and a target-based CMake build proven clean under sanitizers. Targets **C++20/23** for production today. C++23 is ISO/IEC 14882:2024; WG21 froze C++26's technical content on **2026-03-28** (ISO publication follows) — adopt C++26 features only behind confirmed compiler support. Compiler matrix: | Compiler | C++23 | C++26 | Flag | | --- | --- | --- | --- | | GCC | since 11 | since 14 (GCC 16.1 covers most of C++26) | `-std=c++23` / `-std=c++26` | | Clang | 13–18 progressively | in progress (Clang 23 dev) | `-std=c++23` / `-std=c++2c` | | MSVC | latest | partial | `/std:c++23` / `/std:c++latest` | Delegate: borrow-checker, `Result`/`Option`, cargo, ownership-via-compiler -> [`rust`](../rust/SKILL.md) — C++ buys safety with discipline (RAII + smart pointers + sanitizers); do not conflate the mechanisms. Language-agnostic threat modeling, authz, OWASP-class review -> [`secure-coding`](../secure-coding/SKILL.md); the C++-specific memory/UB controls (bounds, lifetime, integer overflow, format-string, sanitizers) stay **here**. Containerizing and shipping the binary -> [`deployment`](../deployment/SKILL.md); this skill stops at the CMake build + a sanitizer-CI note. ## Decision rules Apply these on every C++ edit: 1. **Rule of Zero first.** Manage resources ...