What are the best practices for using constants in C++?

What are the best practices for using constants in C++?

When using constants in C++, it's best to use const or constexpr for defining them. This ensures that the values are immutable and can be evaluated at compile time.

Can you explain the difference between const and constexpr?

Sure! const defines a constant value that cannot be changed after initialization, while constexpr indicates that the value can be evaluated at compile time, allowing for more optimization.

Are there any specific naming conventions I should follow?

Yes, it's common to use uppercase letters with underscores for constant names, like MAX_SIZE, to distinguish them from regular variables.

What about using constants in classes?

In classes, you can use static const or static constexpr for class constants. This allows you to define constants that are associated with the class rather than instances.