@Const
Specifies that a procedure can (and must) calculate a result at compile-time.
Instructions
You can use the modifier @Const with some procedures.
Typically, you use it with methods of a module of the type Library.
But, you can also use it with procedures of the type Sub.
Note:
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.
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.
Rules
- 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.
Applies to
Examples
TODO