Lennart Poettering
319a4f27c4
Quite often when we generate objects some fields should only be generated in some conditions. Let's add high-level support for that. Matching the existing JSON_BUILD_PAIR() this adds JSON_BUILD_PAIR_CONDITIONAL() which is very similar, but takes an additional parameter: a boolean condition. If "true" this acts like JSON_BUILD_PAIR(), but if false then the whole pair is suppressed. This sounds simply, but requires a tiny bit of complexity: when complex sub-variants are used in fields, then we also need to suppress them.
systemd - System and Service Manager
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