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CLASSpp Manual
Cosmology reference and developer manual
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#include <perturb_source_context.h>
Context passed to BaseSpecies::CopyPerturbationsAcrossSwitch(). Bundles the kinematics and background needed for non-trivial migration logic (e.g., NCDM fluid-approximation collapse from full hierarchy to delta/theta/shear). Trivial slot-by-slot copies don't need the body — most species ignore the context.