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Introduction to Modern C++ (C++11/14/17/20) This guide documents key features from the Modern C++ Tutorial: Quick Start with C++11/14/17/20. Chapter 2: Core Language Enhancements Compile-time Constants with constexpr The constexpr keyword allows expressions to be evaluated at compile time, enabling optimizations. constexpr int fibonacci_sequenc ...

Core Mechanisms and Syntax Differences C++11 introduced decltype as a compile-time type inquiry operator. While it shares conceptual ground with auto, their syntactic evaluation and deduction strategies diverge significantly. The auto keyword deduces a variable's type from an initializer expression, whereas decltype inspects an arbitrary expres ...