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malcommac avatar malcommac commented on May 23, 2024

Sometimes you may want to alter the default value of a Flag set via the annotation default parameters.
This is true when, for example, you have different target of your product with different values for some flag and you would avoid creating duplicate files for each Flags Collection blue print.

In this case you can define your own FlagsCollections and use the setDefaultValue() on each different flag to setup your own value.

Consider this example:

struct Flags: FlagCollectionProtocol {
    @FlagCollection(default: 100, description: "...")
    var flagA: Int

    @Flag(default: false, description: "...")
    var flagB: Bool
}

public func setupFlagsByTarget {
    self.loader = FlagsLoader(Flags.self, provider: [...])

    #if TARGET_A
      // Target A only differ for a 200 default value for flagA
      loader.$flagA.setDefault(200)
    #endif
    
    #if TARGET_B
      // Target B only differ in flagB which is false by default
      loader.$flagB.setDefault(false)
    #endif
    
    #if TARGET_C
      // Target C has the same false for flagB but a different value for flagA
      loader.$flagA.setDefault(50)
    #endif
}

from realflags.

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