DataTable< TAB > Class Template Reference

#include "lib/stat/data.hpp"

Description

template<class TAB>
class lib::stat::DataTable< TAB >

Table with data values, stored persistently as CSV file.

Each row within the table represents a data record, holding a sequence of values. Values are statically typed per column, i.e. one column may hold strings, while the next column holds doubles. For actual usage it is thus necessary to define the column layout, through a sequence of column Descriptors.

Usage

Actually those Column objects serve as descriptors, but also as accessors — and they hold the actual data storage for each column, which is a std::vector<VAL> of value type VAL. There is always a current record — corresponding to the actual data value and the newest data row. For persistent storage, the sequence of rows is reversed, so the newest data appears at the top of the CSV file.

Template Parameters

TAB

a struct comprised of several Column objects, which hold the data and provide access to values of this specific column. Moreover, this type must define a function allColumns() to return a tuple with references to these column fields; the order of fields within this tuple also defines the order of columns within the table and persistent CSV storage.

Definition at line 194 of file data.hpp.

Public Member Functions
	DataTable (fs::path csvFile="")
	DataTable (CSVData const &csv)
void	appendFrom (CSVData const &csv)
void	clear ()
void	dropLastRow ()
void	dupRow ()
bool	empty () const
void	newRow ()
CSVData	renderCSV () const
void	reserve (size_t expectedCapacity)
void	save (size_t lineLimit=std::numeric_limits< size_t >::max(), bool backupOld=false)
void	saveAs (fs::path newStorage, size_t lineLimit=std::numeric_limits< size_t >::max())
size_t	size () const

Static Public Attributes
static constexpr size_t	columnCnt = std::tuple_size_v<decltype(std::declval<TAB>().allColumns())>

Private Member Functions
void	appendRowFromCSV (string line)
template<class OP >
void	forAllColumns (OP &&doIt) const
	apply a generic Lambda to all columns
CSVLine	formatCSVRow (size_t rownum) const
CSVLine	generateHeaderSpec () const
void	loadData ()
void	saveData (std::ofstream &csvFile, size_t lineLimit)
void	verifyHeaderSpec (string headerLine)
Private Member Functions inherited from MoveOnly
	MoveOnly (MoveOnly &&)=default
	MoveOnly (MoveOnly const &)=delete
MoveOnly &	operator= (MoveOnly &&)=delete
MoveOnly &	operator= (MoveOnly const &)=delete

Private Attributes
fs::path	filename_

Member Function Documentation

save()

void save ( size_t  lineLimit = std::numeric_limits<size_t>::max(), bool  backupOld = false  )

inline

Parameters

lineLimit

number of rows to retain, back from the newest

Definition at line 323 of file data.hpp.

Inheritance diagram for DataTable< TAB >:

Collaboration diagram for DataTable< TAB >:

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

• data.hpp