StandardAgg< T > Struct Template Reference

Base aggregator template for scalar types (int, float, bool, string). More...

Inheritance diagram for StandardAgg< T >:

Collaboration diagram for StandardAgg< T >:

Public Member Functions
AggValue	finalize () const override
	Return the accumulated value, or NULL if no inputs were seen.
ValueType	inputType () const override
	Return the value type corresponding to T.
Public Member Functions inherited from Aggregator
virtual	~Aggregator ()=default
virtual void	add (const AggValue &x)=0
	Incorporate one input value into the running aggregate.
virtual AggregationOperator	op () const =0
	Return the aggregation operator this accumulator implements.
virtual ValueType	resultType () const
	Return the type of the value returned by finalize().

Protected Attributes
T	value {}
	Current accumulated value.
bool	has = false
	true once the first non-NULL input has been seen

Detailed Description

template<class T>
struct StandardAgg< T >

Base aggregator template for scalar types (int, float, bool, string).

Template Parameters

T	The C++ type of the accumulated value.

Definition at line 90 of file Aggregation.cpp.

Member Function Documentation

finalize()

template<class T >

AggValue StandardAgg< T >::finalize ( ) const

inlineoverridevirtual

Return the accumulated value, or NULL if no inputs were seen.

Implements Aggregator.

Definition at line 97 of file Aggregation.cpp.

inputType()

template<class T >

ValueType StandardAgg< T >::inputType ( ) const

inlineoverridevirtual

Return the value type corresponding to T.

Implements Aggregator.

Definition at line 101 of file Aggregation.cpp.

Member Data Documentation

has

template<class T >

bool StandardAgg< T >::has = false

protected

true once the first non-NULL input has been seen

Definition at line 93 of file Aggregation.cpp.

value

template<class T >

T StandardAgg< T >::value {}

protected

Current accumulated value.

Definition at line 92 of file Aggregation.cpp.

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The documentation for this struct was generated from the following file:

• /home/pierre/git/software/provsql/src/Aggregation.cpp