column::definition

template<typename Out, typename ...Ins>
class definition<Out(Ins...)> : public queryosity::column::calculation<Out>

Column with user-defined return value type and evaluation dataset.

Template Parameters:

• Out – Output data type.

• Ins – Input column data type(s).

Subclassed by queryosity::column::equation< Out(Ins…)>

Public Functions

virtual Out evaluate(observable<Ins>... args) const = 0

Compute the quantity of interest for the entry.

Note

Columns observables are not computed until value() is called.

Parameters:

args – [in] Input column observables.