Ichthyostega 10daa06ba2 clean-up: simplify function-closure -- enable forwarding and remove workarounds ...

This is a rather intricate and technical change, but allows in the end
to switch back all usages to a main implementation patch, which is now
based on `func::BindToArgument` — so this could become the final
implementation core and replace the old `PApply` template eventually...

Largely, these changes are related to allow for ''perfect forwarding''
of the functor and the argument values to be closed; these will be
copied into the ''Binder object'' created by `std::bind`.

Notably the `TupleConstructor` was changed to perfect-forward its »source«
into the specialised `ElmMapper`; this is possible since the latter
already receives a `SRC` template parameter, which can be supplied
with whatever base type the `std::forward` invocation will expose.
In the specialisation relevant here, template `PartiallyInitTuple`,
now an ''universal reference'' is stored and passed to `std::get`,
so that (depending on the input used), either a LValue or an
RValue reference is used for the extracted data elements.

After these changes, all existing usages of `applyFirst()` or `applyLast()`
can be replaced by this modernised implementation back-end, thus obsoleting
the various hard-coded workaround added during the last years.

2025-06-06 03:23:34 +02:00

9.7 MiB

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