to create a constant, there are now always the three functions
Opm::constant<Eval>(value);
Opm::constant<Eval>(numDeriv, value);
Opm::constant<Eval>(x, value); // with 'x' being the 'template' of the returned value
If a given call does not make sense, an exception is thrown:
- Plain floating point objects like `float`, `double` or `quad`
complain if the specified number of derivatives is not zero.
- Statically sized evaluations throw if the specified number of
derivatives of passed to the function is not equal to their static
size.
- Dynamically sized evaluations complain if the number of derivatives
cannot be determined.
The third variant of `Opm::constant()` works unconditionally. The
`Opm::variable()` helpers are modified analogously.
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