Compiler directives enable you to conditionally compile or leave out entire blocks of code. Here is a list of all compiler directives:
With compiler directives, it is easy to have two different versions of a formula. For example, you might have a version that is used for testing and debugging, and a final version. Let’s assume the test version needs to show a different title. The following code would accomplish this:
$define Test ... default: $ifdef Test title = "My Formula (test version)" $else title = "My Formula" $endif
Compiler directives enable you to switch between both versions by simply removing or inserting the $define statement at the top of the formula. (Note that in this example, the browsers will display the first title regardless of the compiler directives that are defined.)
Ultra Fractal 5 always defines the following symbols: ULTRAFRACTAL, VER20, VER30, VER40, and VER50. With the VERxx symbols, you can write formulas that take advantage of features in Ultra Fractal 5 but still compile under Ultra Fractal 4 or 3, where VER50 or even VER40 is not defined. Ultra Fractal 6 will define VER60. Example:
default: param ExtraMagnification caption = "Extra Magnification" $ifdef VER40 ; In Ultra Fractal 4, make sure this parameter is interpolated ; exponentially by default. exponential = true $endif endparam
- Compiler directives are case insensitive. They work across sections, loops and conditionals: they have a separate hierarchy.
- The DEBUG symbol has a special meaning. See Debugging.