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for some places such as refPtr it would be useful to support construct read/write as well as construct read-only. However, there is no convenient or reliable means to do so. Eg,

volScalarField fld(...);

refPtr someRef(fld);

Should this be a const reference or a non-const reference? Currently we only have construct from const-ref since relying on the constness of the supplied argument is fragile at best, or simply wrong.

Propose adding a tagged dispatch constructor. Eg,

//- Construct for a non-const reference to an object.
inline refPtr(T& obj, stdFoam::output_t) noexcept;

I think that input_t and output_t might be reasonable enough names (vs read/write) that might be possibly to use elsewhere as well. Would declare in stdFoam.H to make globally available.