constexpr
Explore the use of constexpr in C++ to define expressions evaluated at compile-time. Understand how constexpr applies to variables, functions, and user-defined types, their restrictions, and advantages. Discover how constexpr functions differ between C++11 and C++14 standards, and compare constexpr functions with template metaprogramming for efficient and safe code execution.
Constant Expressions
You can define, with the keyword constexpr, an expression that can be evaluated at compile-time. constexpr can be used for variables, functions, and user-defined types. An expression that is evaluated at compile-time has a lot of advantages.
A constant expression
- can be evaluated at compile-time.
- gives the compiler deep insight into the code.
- is implicitly