AvgAgg< T > Struct Template Reference

Aggregator implementing AVG; always returns a float result. More...

Inheritance diagram for AvgAgg< T >:

Collaboration diagram for AvgAgg< T >:

Public Member Functions
void	add (const AggValue &x) override
	Incorporate one input value into the running aggregate.
AggValue	finalize () const override
	Return the final aggregate result.
ValueType	inputType () const override
	Return the type of the input values accepted by add().
ValueType	resultType () const override
	Return the type of the value returned by finalize().
Public Member Functions inherited from Aggregator
virtual	~Aggregator ()=default

Protected Attributes
double	sum = 0
	Running sum of all non-NULL input values.
unsigned	count = 0
	Number of non-NULL inputs seen so far.
bool	has = false
	true once the first non-NULL input has been seen

Detailed Description

template<class T>
struct AvgAgg< T >

Aggregator implementing AVG; always returns a float result.

Definition at line 193 of file Aggregation.cpp.

Member Function Documentation

add()

template<class T>

void AvgAgg< T >::add ( const AggValue & x )

inlineoverridevirtual

Incorporate one input value into the running aggregate.

Parameters

x	Input value to add.

Implements Aggregator.

Definition at line 200 of file Aggregation.cpp.

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finalize()

template<class T>

AggValue AvgAgg< T >::finalize ( ) const

inlineoverridevirtual

Return the final aggregate result.

Returns

The accumulated aggregate as an AggValue.

Implements Aggregator.

Definition at line 207 of file Aggregation.cpp.

inputType()

template<class T>

ValueType AvgAgg< T >::inputType ( ) const

inlineoverridevirtual

Return the type of the input values accepted by add().

Returns

The ValueType of values passed to add().

Used (via the resultType() default) to report the aggregate's result type; see makeAggregator() for the operators actually built.

Implements Aggregator.

Definition at line 210 of file Aggregation.cpp.

resultType()

template<class T>

ValueType AvgAgg< T >::resultType ( ) const

inlineoverridevirtual

Return the type of the value returned by finalize().

Defaults to inputType(); override when the result type differs (e.g., AVG returns FLOAT regardless of the input type).

Returns

The ValueType of the value returned by finalize().

Reimplemented from Aggregator.

Definition at line 218 of file Aggregation.cpp.

Member Data Documentation

count

template<class T>

unsigned AvgAgg< T >::count = 0

protected

Number of non-NULL inputs seen so far.

Definition at line 196 of file Aggregation.cpp.

has

template<class T>

bool AvgAgg< T >::has = false

protected

true once the first non-NULL input has been seen

Definition at line 197 of file Aggregation.cpp.

sum

template<class T>

double AvgAgg< T >::sum = 0

protected

Running sum of all non-NULL input values.

Definition at line 195 of file Aggregation.cpp.

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

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