cpp-core-guidelineslisted

# C++ Core Guidelines Rule IDs reference the [C++ Core Guidelines](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines). ## Cross-cutting themes 1. RAII everywhere (P.8, R.1, E.6, CP.20): bind resource lifetime to object lifetime 2. Immutability by default (P.10, Con.1-5, ES.25): `const`/`constexpr` first 3. Type safety (P.4, I.4, ES.46-49, Enum.3): compile-time error prevention 4. Express intent (P.3, F.1, NL.1-2, T.10) 5. Minimize complexity (F.2-3, ES.5, Per.4-5) 6. Value semantics over pointer semantics (C.10, R.3-5, F.20, CP.31) ## Philosophy and interfaces (P.*, I.*) | Rule | Summary | |------|---------| | P.1 | Express ideas directly in code | | P.3 | Express intent | | P.4 | Ideally, a program should be statically type safe | | P.5 | Prefer compile-time checking to run-time checking | | P.8 | Don't leak any resources | | P.10 | Prefer immutable data to mutable data | | I.1 | Make interfaces explicit | | I.2 | Avoid non-const global variables | | I.4 | Make interfaces precisely and strongly typed | | I.11 | Never transfer ownership by a raw pointer or reference | | I.23 | Keep the number of function arguments low | ```cpp // P.10 + I.4: immutable, strongly typed interface struct Temperature { double kelvin; }; Temperature boil(const Temperature& water); // Violations: double boil(double* temp); // unclear ownership, unclear units int g_counter = 0; // I.2: non-const global ``` ## Functions (F.*) | Rule | Summary | |------|---------| | F.1