morph::table::DataSource Class Reference

The rows of a table, as the engine reads them. More...

#include <data_source.hpp>

Inheritance diagram for morph::table::DataSource:

Public Member Functions
virtual std::span< ColumnInfo const >	columns () const =0
	The table's columns.
virtual std::shared_ptr< RowSnapshot const >	snapshot () const =0
	The current rows as an immutable snapshot. Taking one is cheap.
virtual void	subscribe (ChangeListener &listener)=0
	Registers listener for change notifications.
virtual void	unsubscribe (ChangeListener &listener)=0
	Removes listener.

Detailed Description

The rows of a table, as the engine reads them.

Owner-affine: every member is called on the owner thread. The engine reads cells only from snapshot(), which it may hand to a worker.

Definition at line 732 of file data_source.hpp.

Member Function Documentation

columns()

virtual std::span< ColumnInfo const > morph::table::DataSource::columns ( ) const

nodiscardpure virtual

The table's columns.

Returns

The columns, in source order.

Implemented in morph::table::RowsSource< Row >, and morph::table::VectorSource.

snapshot()

virtual std::shared_ptr< RowSnapshot const > morph::table::DataSource::snapshot ( ) const

nodiscardpure virtual

The current rows as an immutable snapshot. Taking one is cheap.

Returns

The snapshot.

Implemented in morph::table::RowsSource< Row >, and morph::table::VectorSource.

subscribe()

virtual void morph::table::DataSource::subscribe ( ChangeListener & listener )

pure virtual

Registers listener for change notifications.

Parameters

listener

Receives notifications until unsubscribe; must outlive the subscription.

Implemented in morph::table::RowsSource< Row >, and morph::table::VectorSource.

unsubscribe()

virtual void morph::table::DataSource::unsubscribe ( ChangeListener & listener )

pure virtual

Removes listener.

Parameters

listener

A listener previously subscribed.

Implemented in morph::table::RowsSource< Row >, and morph::table::VectorSource.

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

• morph/table/data_source.hpp