Modern C++ Quick Reference¶

Features covered in this repo with interview frequency ratings.

C++11/14 Features¶

Feature	One-liner	File	Interview Freq
Move Semantics	Transfer ownership without copying; rvalue refs (`&&`)	`src/modern_cpp/move_semantics.cpp`	★★★★★
Smart Pointers	Automatic lifetime management (unique, shared, weak)	`src/modern_cpp/smart_pointers.cpp`	★★★★★
RAII	Resource acquisition is initialization; deterministic cleanup	`src/modern_cpp/raii.cpp`	★★★★★
Rule of Five	Define dtor + copy/move ctor + copy/move assign together	`src/modern_cpp/rule_of_five.cpp`	★★★★★
Perfect Forwarding	Preserve value category through template layers via `std::forward`	`src/modern_cpp/perfect_forwarding.cpp`	★★★★
Lambda Expressions	Inline closures with capture semantics	`src/modern_cpp/lambdas.cpp`	★★★★
Templates & SFINAE	Compile-time polymorphism; substitution failure is not an error	`src/modern_cpp/templates_sfinae.cpp`	★★★★
Copy Elision / RVO	Compiler omits copy/move in return statements	`src/modern_cpp/copy_elision.cpp`	★★★★
CRTP	Curiously Recurring Template Pattern for static polymorphism	`src/modern_cpp/crtp.cpp`	★★★★
noexcept	Marks functions that won't throw; enables move optimizations	`src/modern_cpp/noexcept.cpp`	★★★
Custom Allocators	Control memory allocation strategy (pool, arena)	`src/modern_cpp/custom_allocator.cpp`	★★★

Feature	One-liner	File	Interview Freq
Structured Bindings	`auto [a, b] = pair;` decompose aggregates	`src/modern_cpp/structured_bindings.cpp`	★★★
std::optional/variant/any	Type-safe nullable, union, and type-erased containers	`src/modern_cpp/optional_variant_any.cpp`	★★★
if constexpr	Compile-time branch elimination in templates	`src/modern_cpp/templates_sfinae.cpp`	★★★
Fold expressions	Variadic template parameter pack expansion	`src/modern_cpp/templates_sfinae.cpp`	★★

Feature	One-liner	File	Interview Freq
Concepts	Named constraints on template parameters	`src/modern_cpp/concepts.cpp`	★★★
Ranges	Composable, lazy view pipelines over sequences	`src/modern_cpp/ranges.cpp`	★★
constexpr (extended)	Almost everything computable at compile time	`src/modern_cpp/constexpr_consteval.cpp`	★★★
consteval	Guaranteed compile-time-only evaluation	`src/modern_cpp/constexpr_consteval.cpp`	★★
Coroutines	Cooperative multitasking with co_await/co_yield	(not yet in repo)	★★
Modules	Replace headers with import declarations	(not yet in repo)	★

Topic	One-liner	File	Interview Freq
Value Semantics	Regular types, spaceship operator, designated initializers	`src/modern_cpp/practical/value_semantics.cpp`	★★★★★
Compile-Time Programming	constexpr tables, consteval hashing, if constexpr dispatch	`src/modern_cpp/practical/compile_time_programming.cpp`	★★★★★
RAII Patterns	ScopeGuard, TimerGuard, C API wrappers, transaction safety	`src/modern_cpp/practical/raii_patterns.cpp`	★★★★★
Error Handling	Result, monadic chaining, optional patterns	`src/modern_cpp/practical/error_handling.cpp`	★★★★
Type Traits & Concepts	Custom concepts, constrained templates, subsumption	`src/modern_cpp/practical/type_traits_concepts.cpp`	★★★★★