How to Define and Utilize Constexpr References Effectively?

Initialising Constexpr References

Question:

How can a constexpr reference, a reference to a constant expression, be effectively defined and utilised?

Answer:

1. Utility of Constexpr References:

Unlike const references, constexpr references are initialised before the program's execution. This is advantageous as it ensures that the reference refers to a constant value throughout the program's lifecycle.

2. Definition of Constexpr References:

To effectively define a constexpr reference:

• The reference must bind to a global variable, ensuring static storage duration.
• The reference may reference a variable declared constexpr within a namespace scope.

Example:

In this example, the reference get_global_ref() refers to the constant variable global_var and can be safely used as a constant reference in constexpr contexts.

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