is Expression
Explore how the is expression in D evaluates type conditions at compile time, enabling flexible static if conditionals and template constraints. Understand its syntax and applications to improve conditional compilation and type checking in your D programs.
We'll cover the following...
We'll cover the following...
The is expression is not related to the is operator that we saw in the null Value and the is Operator chapter, neither syntactically nor semantically:
a is b // is operator, which we have seen before
is (/* ... */) // is expression
The is expression is evaluated at compile time. It produces an int value, either 0 ...