COMP: fix sloppy (and now ambiguous) use of PtrList::set()
- constructs such as the following will no longer worked, but that is also a good thing. ptrlist.set(i, scalarField(nFaces, Zero)); this called set(.., const tmp<scalarField>&), which meant under the hood: - create local temporary const scalarField& - wrap as const tmp& - use tmp::ptr(), to clone the const-ref This implies an additional allocation (for the const scalarField&) which is immediately discarded. Doubtful that compiler optimization would do anything.
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