Binary Operators

The package also provides a set of binary operators that can be used to combine the evaluation of different features. The operators are:

• and: Returns true if the features are evaluated to true.
• or: Returns true if at least one of the features is evaluated to true.
• iff: Returns true if the features' evaluation is the same (in type and value).
• implies: Returns true if the logical implication between features is correct. Given two features: A and B, on which A implies B; if feature A is true, B must be. false will be returned if not.

The usage of the operators is as follows:

<Feature>
    <On expression={and(feature("feature1"), feature("feature2"))}>
        <p>Feature 1 and feature 2 are enabled</p>
    </On>
    ...
</Feature>

<Feature>
    <On expression={or(feature("feature1"), feature("feature2"))}>
        <p>Feature 1 or feature 2 are enabled</p>
    </On>
    ...
</Feature>

<Feature>
    <On expression={iff(feature("feature1"), feature("feature2"))}>
        <p>Feature 1 has the same evaluation as feature 2</p>
    </On>
    ...
</Feature>

<Feature>
    <On expression={implies(feature("feature1"), feature("feature2"))}>
        <p>Because Feature 1 is enabled, feature 2 must be</p>
    </On>
    ...
</Feature>