Since there is no preprocressor in Swift, what replaces C macros?

cocoa, swift

Solution

Swift doesn't have a preprocessor and can't use C macros. There are some alternatives though. For constants you can just use a let statement. For example:

let defaultHeight = 100

There is also some support for build configurations. They have this format.

#if build configuration && !build configuration
    statements
#elseif build configuration
    statements
#else
    statements
#endif

You can replace "build configuration" with the functions `os()` and `arch()` that return true or false. `os()` can take OSX or iOS as arguments while `arch()` can take x86_64, arm, arm64 and i386 as arguments.

You can see more about how Swift replaces C macros here

Problem

Is there a way to do #define, #ifdef and the other powerful macros in Swift?

Original source

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