Class lsst::afw::image::ExposureInfo

class ExposureInfo

A collection of all the things that make an Exposure different from a MaskedImage

The constness semantics of the things held by ExposureInfo are admittedly a bit of a mess, but they’re that way to preserve backwards compatibility for now. Eventually I’d like to make a lot of these things immutable, but in the meantime, here’s the summary:

• Filter is held and returned by value.

• VisitInfo is immutable and is held by a const ptr and has a setter and getter.

• Metadata is held by non-const pointer, and you can get a non-const pointer via a const member function accessor (i.e. constness is not propagated).

• all other types are only accessible through non-const pointers

The setter for Wcs clones its input arguments (this is a departure from the previous behavior for Wcs but it’s safer w.r.t. aliasing and it matches the old (and current) behavior of the Exposure and ExposureInfo constructors, which clone their arguments. The setter for Psf and constructors do not clone the Psf, as Psfs are immutable and hence we don’t need to ensure strict ownership. The setter for Detector does not clone its input argument, because while it technically isn’t, we can safely consider a Detector to be immutable once it’s attached to an ExposureInfo.