Specifies that a procedure can (and must) calculate a result at compile-time.
You can use the modifier @Const with some procedures.
Typically, you use it with methods of a module of the type
But, you can also use it with procedures of the type
Although you cannot use
@Const with procedures of the type
Function, such procedures can operate almost the same.
You call a procedure with
@Const with the statement
Const makes a named constant, which has a value that you cannot change after it is set.
The expression after the operator
= must be a constant expression.
A constant expression calculates a result only from values known at compile-time.
- Data types
- The procedure must return a value of an elementary data type. Also, the procedure can have parameters only of an elementary data type. Typically, these data types have values that you can write as a literal.
- Mixed modifiers
- You cannot use @Const with @Abstract or @Open because which procedure to call is not known at compile-time.
- You cannot use @Const with @Iterator because an iterator procedure wraps its return type in an object.
- You can use @Const with @MustUse. But, @Const has the same effect as @MustUse to cause you to use the return value.